Annual report pursuant to Section 13 and 15(d)

Share-Based Compensation (Narrative) (Details)

v3.3.1.900
Share-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Cash-settled restricted stock unit awards $ 10,128 $ 3,856  
Payments to settle vested liability share-based awards $ 3,925 $ 2,052 $ 239
Stock options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of years company issued no stock options 3 years    
Issued, shares 0    
Vested, shares 0    
Forfeited, shares 0    
Exercised, shares 0    
Expired, shares 15,000    
Outstanding, shares 15,000 30,000 52,000
Exercisable, shares 15,000 30,000 52,000
Outstanding, end of year, weighted average exercise price per option $ 14.37 $ 14.04 $ 13.75
Share-based payment award outstanding aggregate intrinsic value $ 0 $ 0 $ 0
Outstanding options weighted-average remaining contract life per unit 1 year 3 months 18 days 1 year 3 months 18 days 2 years 8 months 12 days
RSU RSU equity awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average period over which expense is expected to be recognized 1 year 6 months    
Vested in period 1,012,000    
Cash-settleable RSU awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average period over which expense is expected to be recognized 1 year 9 months 18 days    
Unvested RSUs [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average period over which expense is expected to be recognized 1 year 9 months 18 days    
Non-Market Based Cash-settleable RSU Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Payments to settle vested liability share-based awards $ 545 $ 559  
Vested in period 72,108 58,000  
Market-based Cash-settleable RSU Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Payments to settle vested liability share-based awards   $ 1,241  
Vested in period 853,673 523,000  
2011 Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares available for grant 2,926,545    
Vesting in 2014 [Member] | Market-based Cash-settleable RSU Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Payments to settle vested liability share-based awards $ 3,599    
Vesting in 2015 [Member] | Market-based Cash-settleable RSU Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Payments to settle vested liability share-based awards 3,319    
Vesting in 2016 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Cash-settled restricted stock unit awards $ 9,807    
Vesting Minimum [Member] | Cash-settleable RSU awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation arrangement vesting rights, percentage 0.00%    
Vesting Minimum [Member] | Non-Market Based Cash-settleable RSU Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation arrangement vesting rights, percentage 150.00%    
Vesting Minimum [Member] | Market-based Cash-settleable RSU Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation arrangement vesting rights, percentage   150.00%  
Vesting Maximum [Member] | Cash-settleable RSU awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation arrangement vesting rights, percentage 200.00%    
Vesting Maximum [Member] | Non-Market Based Cash-settleable RSU Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation arrangement vesting rights, percentage 200.00%    
Vesting Maximum [Member] | Market-based Cash-settleable RSU Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation arrangement vesting rights, percentage   200.00%