Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Schedule of Repurchase Agreements (Details)

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Stockholders' Equity - Schedule of Repurchase Agreements (Details) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Equity, Class of Treasury Stock [Line Items]      
Common stock repurchased (in shares) 158,965 143,717  
Common stock repurchased, value $ 588,480 $ 534,040  
Treasury stock value $ 17,757   $ 23,727
Open Market      
Equity, Class of Treasury Stock [Line Items]      
Common stock repurchased (in shares) 158,965 143,717  
Common stock repurchased, value $ 588,480 $ 534,040