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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 22,302	$ 12,080	$ 20,096	$ (41,820)
Hedging activity:
Interest rate swap settlements	(147)	(110)	(217)	(304)
Interest rate swap amounts reclassified into interest expense	156	112	247	320
Unrealized gain (loss) resulting from changes in fair value of derivative instruments	863	15	1,503	(263)
Unrealized gain resulting from changes in fair value of marketable securities	0	18	0	64
Other comprehensive income (loss)	872	35	1,533	(183)
Income tax (benefit) provision related to items of other comprehensive income (loss)	235	0	413	0
Other comprehensive income (loss), net of tax	637	35	1,120	(183)
Comprehensive income (loss) attributable to common stockholders	$ 22,939	$ 12,115	$ 21,216	$ (42,003)

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