CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ 165,444	$ 31,266	$ (777,954)	$ 85,730
Other comprehensive income (loss):
Net unrealized gain (loss) on available-for-sale securities	52,393	8,562	(28,126)	15,280
Reclassification of unrealized loss (gain) on available-for-sale securities to net income	2,718	(2,822)	(11,080)	(12,315)
Net unrealized loss on interest rate agreements	0	(9,501)	(32,806)	(15,339)
Reclassification of unrealized loss on interest rate agreements to net income	1,029	0	1,108	0
Total other comprehensive income (loss)	56,140	(3,761)	(70,904)	(12,374)
Total Comprehensive Income (Loss)	$ 221,584	$ 27,505	$ (848,858)	$ 73,356