Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events (Details)

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Subsequent Events (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Oct. 09, 2018
Jul. 18, 2018
Apr. 26, 2018
Jan. 23, 2018
Oct. 22, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Subsequent Event [Line Items]                  
Stock repurchased during the period, value               $ 661,760 $ 996,263
Dividends declared per common share (in dollars per share)   $ 0.011 $ 0.011 $ 0.011   $ 0.011 $ 0.010 $ 0.033 $ 0.03
Subsequent Event                  
Subsequent Event [Line Items]                  
Common stock repurchased (in shares)         7,902        
Stock repurchased during the period, value         $ 48,882        
Dividends declared per common share (in dollars per share) $ 0.0121