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 Thousands, $ in Thousands
1 Months Ended 3 Months Ended
Apr. 23, 2018
Mar. 31, 2018
Mar. 31, 2017
Subsequent Event [Line Items]      
Common stock repurchased, value   $ 294,728  
Open Market      
Subsequent Event [Line Items]      
Common stock repurchased (in shares)   52,264 61,539
Common stock repurchased, value   $ 294,728 $ 298,557
Subsequent Event | Open Market      
Subsequent Event [Line Items]      
Common stock repurchased (in shares) 2,274    
Common stock repurchased, value $ 14,028