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Stock-Based Incentive Plans (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Apr. 20, 2016
$ / shares
shares
Feb. 01, 2016
$ / shares
shares
Mar. 31, 2016
USD ($)
plan
$ / shares
shares
Mar. 31, 2015
USD ($)
Dec. 31, 2015
$ / shares
shares
Stock-Based Compensation          
Number of stock-based incentive plans | plan     1    
Number of stock option plans superseded | plan     2    
Aggregate Intrinsic Value          
Granted (in shares)     0   0
Stock options outstanding and expected to vest     0    
Total intrinsic value of options exercised (in dollars) | $     $ 200 $ 1,200  
Unrecognized compensation cost and vesting period          
Unrecognized compensation costs related to unvested share-based compensation arrangements | $     $ 16,100    
Weighted-average period for recognition of unrecognized stock-based compensation expense     2 years 3 months 18 days    
Restricted Stock Units          
Stock-Based Compensation          
Weighted average granted date fair value (in dollars per share) | $ / shares   $ 32.63      
Restricted stock unit activity          
Outstanding at the beginning of the period (in shares)     527,000    
Awarded (in shares)   431,439 431,000    
Vested (in shares)     (324,000)    
Forfeited (in shares)     (4,000)    
Outstanding at the end of the period (in shares)     630,000   527,000
Outstanding and expected to vest at end of the period (in shares)     615,000    
Weighted-Average Exercise Price          
Weighted-average exercise price at beginning of the period (in dollars per share) | $ / shares     $ 31.56    
Weighted-average exercise price at end of the period (in dollars per share) | $ / shares     31.81   $ 31.56
Outstanding and expected to vest at the end of the period (in dollars per share) | $ / shares     $ 31.81    
Aggregate Intrinsic Value          
Outstanding at the end of the period (in dollars) | $     $ 24,048    
Outstanding and expected to vest at end of the period (in dollars) | $     $ 23,484    
Aggregate Intrinsic Value          
Closing price per share (in dollars per share) | $ / shares     $ 38.17    
Total intrinsic value of awards vested (in dollars) | $     $ 10,300 $ 9,700  
Restricted Stock Units | Subsequent Event          
Stock-Based Compensation          
Weighted average granted date fair value (in dollars per share) | $ / shares $ 38.00        
Non-Qualified Stock Options          
Non-Qualified Stock Options activity          
Exercisable at the start of the period (in shares)     523,000    
Exercised (in shares)     (35,000)    
Forfeited (in shares)     (1,000)    
Exercisable at the end of the period (in shares)     487,000   523,000
Weighted-Average Exercise Price          
Weighted-average exercise price at beginning of the period (in dollars per share) | $ / shares     $ 29.55    
Weighted-average exercise price at end of the period (in dollars per share) | $ / shares     $ 29.60   $ 29.55
Weighted-average remaining contractual life     1 year 9 months 18 days    
Aggregate Intrinsic Value          
Outstanding at the end of the period (in dollars) | $     $ 4,174    
Non Employee Directors | Restricted Stock Units | Subsequent Event          
Restricted stock unit activity          
Awarded (in shares) 1,800