Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans (Details)

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Employee Benefit Plans (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
RSUs [Member]
Apr. 30, 2012
Senior Vice President of Finance [Member]
RSUs [Member]
Apr. 30, 2010
Senior Vice President of Finance [Member]
RSUs [Member]
Sep. 30, 2010
Chief Operating Officer [Member]
RSUs [Member]
Dec. 31, 2011
Chief Operating Officer [Member]
RSUs [Member]
Sep. 30, 2010
Chief Operating Officer [Member]
Performance Shares [Member]
May 31, 2011
2011 Plan [Member]
Dec. 31, 2012
2011 Plan [Member]
May 12, 2011
2011 Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                        
Defined Contribution Plan, Employer Discretionary Contribution Amount $ 918 $ 811 $ 690                  
Number of Shares Authorized                   3,141   2,300
Number of Additional Shares Transferred                   841    
Number of Shares Available for grant                     1,669  
Expiration Period                     10 years  
Granted       1,008 100 50            
Forfeited in Period       101     200   333      
Vested in Period       530 [1]     167          
Non-cash expense related to equity share-based awards $ 1,697 $ 1,337 $ 2,347         $ 180        
[1] The fair value of shares vested was $2,817.