Quarterly report pursuant to Section 13 or 15(d)

Equity Share Repurchase Program (Details)

v3.7.0.1
Equity Share Repurchase Program (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Equity [Abstract]        
Number of shares authorized to be repurchased under stock repurchase program (in shares) 75,000,000   75,000,000  
Number of shares repurchased and retired to date (in shares) 24,135,000   24,135,000  
Cost of shares repurchased and retired to date $ 200,375   $ 200,375  
Repurchase of common stock (in shares) 0 0 0 (8,020,000)
Repurchase of common stock $ 0 $ 0 $ 0 $ (61,307)