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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Statement of Comprehensive Income [Abstract]    
Net Income $ 46,845 $ 36,969
Other comprehensive (loss) income:    
Net unrealized (loss) gain on available-for-sale securities [1] (4,237) 2,930
Reclassification of unrealized gain on available-for-sale securities to net income (9,387) (3,928)
Net unrealized gain on interest rate agreements 8,431 1,733
Reclassification of unrealized loss on interest rate agreements to net income 0 14
Total other comprehensive (loss) income (5,193) 749
Total Comprehensive Income $ 41,652 $ 37,718
[1] Amounts are presented net of tax provision of $0.1 million for both the three months ended March 31, 2018 and 2017.