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Stock Plans - Plans and Awards (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2012
Unrecognized share-based compensation costs        
Unrecognized Share-Based Compensation Costs $ 37,268      
Weighted Average Period Expected to be Recognized 2 years 7 months 6 days      
Inducement Plan        
Equity Compensation Plans        
Common stock available for issuance (in shares)   0    
2010 Stock Incentive Plan        
Equity Compensation Plans        
Maximum number of shares authorized to be issued 6,800,000      
Shares reserved for future issuance        
Total shares reserved to cover outstanding stock options, vesting of RSUs, and additional grants 3,900,000      
2000 Stock Incentive Plan        
Equity Compensation Plans        
Common stock available for issuance (in shares) 0      
Number of options outstanding (in shares) 200,000      
Expiration term 7 years      
2000 Stock Incentive Plan | Minimum        
Equity Compensation Plans        
Vesting period 2 years      
2000 Stock Incentive Plan | Maximum        
Equity Compensation Plans        
Vesting period 5 years      
Stock Options        
Equity Compensation Plans        
Number of options outstanding (in shares) 2,064,000 2,598,000 2,391,000 2,322,000
Unrecognized share-based compensation costs        
Unrecognized Share-Based Compensation Costs $ 4,252      
Weighted Average Period Expected to be Recognized 1 year 3 months 18 days      
Vested        
Number of Shares 1,609,000      
Weighted Average Exercise Price $ 32.95      
Weighted Average Remaining Contractual Life 5 years 3 months 18 days      
Aggregate Intrinsic Value $ 1,671      
Expected to vest        
Number of shares 435,000      
Weighted Average Exercise Price $ 32.75      
Weighted Average Remaining Contractual Life 6 years 7 months 6 days      
Total        
Number of shares 2,044,000      
Weighted Average Exercise Price $ 32.91      
Weighted Average Remaining Contractual Life 5 years 7 months 6 days      
Aggregate Intrinsic Value $ 1,671      
Closing price $ 20.56      
Stock Options | Inducement Plan        
Equity Compensation Plans        
Vesting period   3 years    
Term of awards   10 years    
Number of options outstanding (in shares) 88,200      
Option awards granted (in shares)   124,500    
Stock Options | 2010 Stock Incentive Plan        
Equity Compensation Plans        
Vesting period 3 years      
Number of options outstanding (in shares) 1,800,000      
Stock Options | 2010 Stock Incentive Plan | Minimum        
Equity Compensation Plans        
Term of awards 7 years      
Stock Options | 2010 Stock Incentive Plan | Maximum        
Equity Compensation Plans        
Term of awards 10 years      
Restricted Stock Awards and Restricted Stock Units | 2010 Stock Incentive Plan | Minimum        
Equity Compensation Plans        
Vesting period 1 year      
Restricted Stock Awards and Restricted Stock Units | 2010 Stock Incentive Plan | Maximum        
Equity Compensation Plans        
Vesting period 5 years      
Restricted Stock Units        
Unrecognized share-based compensation costs        
Unrecognized Share-Based Compensation Costs $ 5,581      
Weighted Average Period Expected to be Recognized 2 years      
Restricted Stock Units | Inducement Plan        
Equity Compensation Plans        
Number of RSUs outstanding (in shares) 27,700      
Awards granted (in shares)   87,000    
Restricted Stock Units | Inducement Plan | Minimum        
Equity Compensation Plans        
Vesting period   2 years    
Restricted Stock Units | Inducement Plan | Maximum        
Equity Compensation Plans        
Vesting period   4 years    
Restricted Stock Units | 2010 Stock Incentive Plan        
Equity Compensation Plans        
Number of RSUs outstanding (in shares) 500,000      
Restricted Stock Awards        
Unrecognized share-based compensation costs        
Unrecognized Share-Based Compensation Costs $ 21,523      
Weighted Average Period Expected to be Recognized 2 years 9 months 18 days      
Performance Share Units        
Unrecognized share-based compensation costs        
Unrecognized Share-Based Compensation Costs $ 5,912      
Weighted Average Period Expected to be Recognized 3 years 1 month 6 days