Annual report pursuant to Section 13 and 15(d)

Subsequent Events - Additional Information (Details)

v3.6.0.2
Subsequent Events - Additional Information (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
1 Months Ended 12 Months Ended
Jan. 24, 2017
Oct. 26, 2016
Jan. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Subsequent Event [Line Items]            
Common stock repurchased (in shares)       420,111 524,222 739,016
Common stock repurchased, value       $ 1,672,697 $ 2,015,947 $ 2,522,832
Dividends declared per common share (in dollars per share)   $ 0.01   $ 0.01 $ 0 $ 0
Open Market            
Subsequent Event [Line Items]            
Common stock repurchased (in shares)       420,111 524,222 422,965
Common stock repurchased, value       $ 1,672,697 $ 2,015,947 $ 1,426,428
Subsequent Event            
Subsequent Event [Line Items]            
Dividends declared per common share (in dollars per share) $ 0.01          
Subsequent Event | Open Market            
Subsequent Event [Line Items]            
Common stock repurchased (in shares)     26,676      
Common stock repurchased, value     $ 122,679