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Condensed Consolidated Statement of Comprehensive Income (Unaudited) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Statement of Comprehensive Income [Abstract]        
Net income available to common stockholders $ 55,381 $ 57,208 $ 146,491 $ 121,946
Foreign currency translation adjustment 0 0 0 3,811
Comprehensive income $ 55,381 $ 57,208 $ 146,491 $ 125,757