Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity Share Repurchase Program (Details)

v3.19.1
Stockholders' Equity Share Repurchase Program (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Equity [Abstract]      
Number of shares authorized to be repurchased under stock repurchase program (in shares) 37,500,000    
Number of shares repurchased and retired to date (in shares) 12,067,500    
Cost of shares repurchased and retired to date $ 200,400    
Repurchase of common stock (in shares) 0 0 4,010,000
Repurchase of common stock $ 0 $ 0 $ 61,307