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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 $ 36,324 $ 41,281 $ 73,293 $ 53,344
Other comprehensive income (loss):        
Net unrealized gain (loss) on available-for-sale securities [1] 1,811 6,260 4,741 (3,843)
Reclassification of unrealized gain on available-for-sale securities to net income (2,322) (7,711) (6,250) (18,664)
Net unrealized loss on interest rate agreements (2,429) (8,949) (696) (23,192)
Reclassification of unrealized loss on interest rate agreements to net income 14 19 28 37
Total other comprehensive income (loss) (2,926) (10,381) (2,177) (45,662)
Total Comprehensive Income $ 33,398 $ 30,900 $ 71,116 $ 7,682
[1] Amounts are presented net of tax benefit (provision) of $0.1 million and $(0.1) million for the three and six months ended June 30, 2017, respectively, and $0.3 million and $0.4 million for the three and six months ended June 30, 2016, respectively.