Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 18,241	$ 23,810	$ 26,492	$ 30,359
Other comprehensive income (loss):
Unrealized gains (losses) on cash flow hedge instruments	(3,238)	1,291	(4,993)	4,625
Reclassification of unrealized losses (gains) on cash flow hedge instruments to interest expense	(349)	(32)	(709)	116
Comprehensive income	$ 14,654	$ 25,069	$ 20,790	$ 35,100