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Stockholders' Equity (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Jun. 13, 2016
Jan. 16, 2015
Jul. 21, 2014
Equity, Class of Treasury Stock [Line Items]            
Stock Repurchase Program, Authorized Amount       $ 150,000 $ 100,000 $ 100,000
Stock Repurchased and Retired During Period, Shares 1,133,553 0        
Payments for Repurchase of Equity   $ (1,600) $ (100,000)      
sharesreceivedforexercisepriceofoptions   46,174        
payment exercise of stock option   $ 2,200        
Stock Repurchased and Retired During Period, Value $ (43,091) $ (3,819) $ (100,048)      
Stock Issued During Period, Shares, Acquisitions   794,700        
Stock Issued During Period, Value, Acquisitions   $ 30,183        
Common Stock [Member]            
Equity, Class of Treasury Stock [Line Items]            
Stock Repurchased and Retired During Period, Shares 1,133,553 89,174 3,359,604      
Stock Repurchased and Retired During Period, Value $ (11) $ (1) $ (33)      
Stock Issued During Period, Shares, Acquisitions   794,700        
Stock Issued During Period, Value, Acquisitions   $ 8        
Additional Paid-in Capital [Member]            
Equity, Class of Treasury Stock [Line Items]            
Payments for Repurchase of Equity   (400)        
payment exercise of stock option   800        
Stock Repurchased and Retired During Period, Value (11,885) (1,173) (31,194)      
Stock Issued During Period, Value, Acquisitions   30,175        
Retained Earnings [Member]            
Equity, Class of Treasury Stock [Line Items]            
Payments for Repurchase of Equity   (1,200)        
payment exercise of stock option   1,400        
Stock Repurchased and Retired During Period, Value $ (31,195) $ (2,645) $ (68,821)