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Stock-Based Compensation Plans - Options Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 13,849 $ 11,931 $ 21,482  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 167,800   92,000  
Restricted stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized       29,218
Compensation expense recognized $ 1,300      
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares exercised (in shares) 1,000 182,000 7,000  
Total intrinsic value of options exercised $ 100 $ 9,600 $ 300  
Cash received from exercised options $ 100 $ 6,400 $ 300  
Shares exercisable at period end (in shares)   10,000    
Shares exercised, weighted average exercise price (in dollars per share)   $ 48.63    
2007 Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options, contractual term (in years) 10 years      
Award vesting period (in years) 3 years      
Employee Agreement | Common Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares exercised (in shares)   180,000    
Shares granted (in dollars per share)   $ 35.19    
Shares exercised, minimum price (in dollars per share)   85.00    
Shares exercised, maximum price (in dollars per share)   $ 91.33