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Stock Repurchase Plan & Share-Based Compensation (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
May. 20, 2015
$ / shares
shares
Mar. 31, 2016
USD ($)
installment
multiplier
component
$ / shares
shares
Mar. 31, 2015
USD ($)
multiplier
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Share-Based Compensation        
Share-based compensation expense (in dollars) | $   $ 1,900 $ 400  
Estimated unrecognized compensation costs (in dollars) | $   $ 10,400    
Weighted average remaining requisite service period for stock options over which unrecognized compensation costs would be recognized   2 years 7 months 25 days    
Stock options granted (less than 0.1 million in 2015) (in shares)   100,000 100,000  
Weighted average exercise price of stock options granted (in usd per share) | $ / shares     $ 26.42  
Weighted average fair value of stock options granted and total intrinsic value of stock options exercised        
Weighted average grant date fair value of stock options granted per share | $ / shares   $ 15.77 $ 11.56  
Intrinsic value of options exercised | $   $ 601 $ 176  
Grant date fair value of stock options that vested | $   $ 187 $ 264  
Option        
Share-Based Compensation        
Outstanding (in shares)   3,164,157   3,163,125
Stock options granted (less than 0.1 million in 2015) (in shares)   66,000    
Weighted average exercise price of stock options granted (in usd per share) | $ / shares   $ 27.48    
Weighted average fair value of stock options granted and total intrinsic value of stock options exercised        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price | $ / shares   $ 20.40   $ 20.13
Weighted average contractual term   4 years 6 months 26 days   4 years 11 months 9 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value | $   $ 26,028   $ 35,842
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period   40,000    
Exercised (in usd per share) | $ / shares   $ 9.14    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period   24,968    
Forfeited (in usd per share) | $ / shares   $ 24.25    
Exercisable at the end of the period (in shares)   2,181,083    
Exercisable at the end of the period (in usd per share) | $ / shares   $ 14.70    
Exercisable at the end of the period   2 years 8 months 12 days    
Exercisable at the end of the period (in dollars) | $   $ 24,063    
Employee and Non Employee Stock Option | Vesting Based on Service        
Share-Based Compensation        
Outstanding (in shares)   1,200,000    
Employee and Non Employee Stock Option | Vesting Based on Service | Minimum        
Share-Based Compensation        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   3 years    
Employee and Non Employee Stock Option | Vesting Based on Service | Maximum        
Share-Based Compensation        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   4 years    
Expiration term   10 years    
Employee and Non Employee Stock Option | Market-Based        
Share-Based Compensation        
Outstanding (in shares)   2,000,000    
Number of components of an award | component   2    
Vesting percentage for awards that vest upon achievement of certain criteria   25.00%    
Cumulative vesting percentage for awards that vest in equal annual installments   75.00%    
Number of equal annual installments for vesting of award | installment   3    
Employee and Non Employee Stock Option | Market-Based, ordinary performance        
Share-Based Compensation        
Market-based options subject to specified performance achievement   0.67    
Multiplier of stock price over exercise price as a condition for the award to vest | multiplier   2    
Employee and Non Employee Stock Option | Market-Based, ordinary performance | Minimum        
Share-Based Compensation        
Percentage of compounded annual gain of stock price over exercise price required for the award to vest   20.00%    
Employee and Non Employee Stock Option | Market-Based, extraordinary performance        
Share-Based Compensation        
Market-based options subject to specified performance achievement     0.33  
Multiplier of stock price over exercise price as a condition for the award to vest | multiplier     3  
Employee and Non Employee Stock Option | Market-Based, extraordinary performance | Minimum        
Share-Based Compensation        
Percentage of compounded annual gain of stock price over exercise price required for the award to vest   25.00%    
Share Repurchase Program 2015 [Member]        
Stock Repurchase Plan        
Number of shares of common stock authorized to be purchased (in shares) 3,000,000      
Percentage of outstanding shares authorized to be repurchased 15.00%      
Minimum purchase price authorized (in usd per share) | $ / shares $ 1.00      
Maximum purchase price authorized (in usd per share) | $ / shares $ 500.00      
Stock Repurchase Programs        
Stock Repurchase Plan        
Number of shares of common stock purchased (in shares)   500,000 200,000  
Average purchase price per share (in usd per share) | $ / shares   $ 25.17 $ 23.44  
Remaining number of shares available for repurchase under the plan (in shares)   1,000,000    
Capacity available to repurchase common stock under senior secured term loan (in dollars) | $   $ 333,000