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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - 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 $ 36,180 $ 52,553 $ 109,473 $ 105,897
Other comprehensive income (loss):        
Net unrealized gain on available-for-sale securities [1] 13,158 9,038 17,899 5,195
Reclassification of unrealized gain on available-for-sale securities to net income (853) (1,319) (7,103) (19,983)
Net unrealized gain (loss) on interest rate agreements 321 647 (375) (22,545)
Reclassification of unrealized loss on interest rate agreements to net income 14 18 42 55
Total other comprehensive income (loss) 12,640 8,384 10,463 (37,278)
Total Comprehensive Income $ 48,820 $ 60,937 $ 119,936 $ 68,619
[1] Amounts are presented net of tax benefit (provision) of zero and $(0.1) million for the three and nine months ended September 30, 2017, respectively, and $0.2 million and $0.6 million for the three and nine months ended September 30, 2016, respectively.