Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events - Capital Return Program (Details)

v3.8.0.1
Subsequent Events - Capital Return Program (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Oct. 03, 2017
Jul. 11, 2017
Oct. 23, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Subsequent Event [Line Items]              
Common stock repurchased, value           $ 987,111  
Dividends declared per common share (in dollars per share)   $ 0.010   $ 0.010 $ 0 $ 0.030 $ 0
Open Market              
Subsequent Event [Line Items]              
Common stock repurchased (in shares)           194,324 315,051
Common stock repurchased, value           $ 987,111 $ 1,214,083
Subsequent Event              
Subsequent Event [Line Items]              
Dividends declared per common share (in dollars per share) $ 0.011            
Subsequent Event | Open Market              
Subsequent Event [Line Items]              
Common stock repurchased (in shares)     6,452        
Common stock repurchased, value     $ 36,388