Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Schedule of Repurchase Agreements (Details)

v3.8.0.1
Stockholders' Equity - Schedule of Repurchase Agreements (Details) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Shares Repurchase Activity [Line Items]      
Amount $ 294,728    
Treasury stock value $ 3,123   $ 17,154
Open Market      
Shares Repurchase Activity [Line Items]      
Shares (in shares) 52,264 61,539  
Amount $ 294,728 $ 298,557