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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Statement of Comprehensive Income [Abstract]        
Net income $ 20,660 $ 21,767 $ 42,327 $ 43,786
Other comprehensive (loss) income:        
Change in unrealized net gain on available-for-sale securities (3,394) 3,292 (6,841) 2,515
Change in value of interest rate cap (112) 27 (56) 43
Comprehensive income $ 17,154 $ 25,086 $ 35,430 $ 46,344