CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 16,905	$ 12,132	$ 14,711	$ 11,591
Other comprehensive income (loss) before taxes:
Change in fair value of interest rate swap and interest rate cap agreements	1,197	42	5,203	2,144
Provision for income tax benefit (expense) related to components of other comprehensive income (loss)	(326)	(16)	(1,418)	(815)
Other comprehensive income (loss)	871	26	3,785	1,329
Comprehensive income (loss)	$ 17,776	$ 12,158	$ 18,496	$ 12,920