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Stockholders' Equity (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Jan. 21, 2015
Dec. 31, 2014
Feb. 25, 2010
Class of Stock [Line Items]        
Stock Repurchased and Retired During Period, Value $ (80,000)      
Number of shares authorized to be repurchased under the plan   20,000,000.0 19,000,000  
UpfrontPaymentUnderAcceleratedStockRepurchaseProgram $ 100,000      
Stock Repurchased and Retired During Period, Shares (7,812,000)      
UnsettledForwardContractIndexedtoIssuersStockClassifiedwithinStock $ 20,000      
Additional number of shares authorized to be repurchased       12,500,000
Cumulative shares that have been repurchased in stock repurchase program     26,300,000  
Cumulative value of shares that have been repurchased in stock repurchase program     $ 428,900  
Remaining shares authorized to be repurchased 12,200,000   5,200,000  
Retained Earnings [Member]        
Class of Stock [Line Items]        
Stock Repurchased and Retired During Period, Value $ (54,179)