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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of Comprehensive Income [Abstract]      
Net income available to common stockholders $ 156,270 $ 127,581 $ 91,372
Change in net unrealized gain on securities available-for-sale 0 0 678
Foreign currency translation adjustment 3,811 (638) (866)
Comprehensive income $ 160,081 $ 126,943 $ 91,184