Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation (Details)

v3.8.0.1
Stock-Based Compensation (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 22, 2010
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jul. 13, 2017
Stock-Based compensation          
Maximum number of shares available for future issuance   3,960,729      
Unvested restricted stock units and awards          
Stock-Based compensation          
Unrecognized compensation expense related to shares   $ 42,250      
Awards   959,591 1,009,661 1,508,796  
2004 Plan          
Stock-Based compensation          
Share-based awards, contractual term   10 years      
2010 Plan          
Stock-Based compensation          
Maximum number of shares available for future issuance         3,525,000
Share-based awards, contractual term 10 years        
Shares reserved for delivery 2,700,000        
2012 Plan          
Stock-Based compensation          
Shares authorized for issuance   1,023,851      
2012 Plan | Target Incentive Awards          
Stock-Based compensation          
Shares authorized for issuance   559,551      
Unvested restricted stock, service condition period   2 years      
2012 Plan | Target Incentive Awards | Minimum          
Stock-Based compensation          
Vesting rights   P3Y      
2012 Plan | Target Incentive Awards | Maximum          
Stock-Based compensation          
Vesting rights   P5Y      
2015 Plan          
Stock-Based compensation          
Shares authorized for issuance   1,058,807      
Awards   0