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Condensed Consolidated Statement of Comprehensive Income (Unaudited) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Statement of Comprehensive Income [Abstract]        
Net income available to common stockholders $ 57,208 $ 60,583 $ 121,946 $ 77,864
Foreign currency translation adjustment 0 73 3,811 499
Comprehensive income $ 57,208 $ 60,656 $ 125,757 $ 78,363