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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 154,333	$ 159,365	$ 152,716
Other comprehensive income (loss):
Change in unrealized gains on securities	0	(26)	5,072
Less: reclassification adjustment for gains in net income	0	(10,038)	(29,673)
Increase (decrease) in fair value of cash flow hedge	1,722	884	(1,506)
Less: reclassification adjustment for amounts recognized in net income	164	2,627	3,928
Total other comprehensive income (loss)	1,886	(6,553)	(22,179)
Comprehensive income	156,219	152,812	130,537
Less: comprehensive income attributable to noncontrolling interest	0	0	(1,176)
Comprehensive income attributable to common stockholders	$ 156,219	$ 152,812	$ 129,361

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