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Stockholders' Equity (Details) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
Jan. 07, 2016
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
May 23, 2016
Stockholders' Equity Note [Abstract]                          
Repurchase of treasury stock (in shares)                   388,063 1,244,433    
Shares withheld for tax withholding obligations for the vesting of restricted stock awards (in shares)                   101,335 114,523    
Stock Repurchase Program, Number of Shares Authorized to be Repurchased                         1,000,000
Remaining number of shares authorized to be repurchased (in shares)   1,136,269               1,136,269      
MaxAmountOfTenderOfferForRepurchaseOfShares $ 125,000,000                        
Share Price $ 47.50                        
Stock Repurchased and Retired During Period, Shares 3,013,531                        
Repurchase of common stock $ 143,100,000                 $ (144,263,000)      
Transaction Costs Related to Tender Offer 1,100,000                        
Long-term debt $ 104,400,000 $ 104,400,000       $ 0       104,400,000 $ 0    
Payments of Dividends [Abstract]                          
Dividends declared per share of common stock (in dollars per share)   $ 0.25 $ 0.25 $ 0.25 $ 0.22 $ 0.22 $ 0.22 $ 0.22 $ 0.19        
Dividends paid                   $ 20,599,000 $ 21,153,000 $ 69,493,000  
Class of Stock [Line Items]                          
Preferred stock, authorized (in shares)   20,000,000       20,000,000       20,000,000 20,000,000    
Common stock purchase right per preferred stock share (in shares)                   1      
Preferred Stock, Value, Issued   $ 0       $ 0       $ 0 $ 0    
Series A Junior Participating Preferred Stock [Member]                          
Class of Stock [Line Items]                          
Preferred stock, authorized (in shares)   600,000               600,000