Annual report pursuant to Section 13 and 15(d)

Share-Based Compensation (Summary of Liability for Cash-Settled RSU Awards) (Details)

v3.6.0.2
Share-Based Compensation (Summary of Liability for Cash-Settled RSU Awards) (Details) - Cash-settleable RSU awards [Member] - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total liability for cash-settled RSU awards $ 16,990 $ 15,005
Current Liabilities [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Liability for cash-settled RSU awards, Current 8,919 10,128
Non-current Liabilities [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Liability for cash-settled RSU awards, Non-current $ 8,071 $ 4,877