CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (53,675)	$ 5,192	$ (53,900)	$ (2,422)
Hedging activity:
Interest rate swap settlements	(149)	0	(194)	0
Interest rate swap amounts reclassified into interest expense	138	0	208	0
Unrealized loss resulting from changes in fair value of derivative instruments	(212)	0	(278)	0
Unrealized gain (loss) resulting from changes in fair value of marketable securities	23	44	46	(39)
Other comprehensive (loss) income, before tax	(200)	44	(218)	(39)
Income tax expense related to items of other comprehensive loss	0	0	0	0
Other comprehensive (loss) income, net of tax	(200)	44	(218)	(39)
Comprehensive (loss) income	(53,875)	5,236	(54,118)	(2,461)
Less: Comprehensive loss attributable to noncontrolling interests	0	(3)	0	(9)
Comprehensive (loss) income attributable to common stockholders	$ (53,875)	$ 5,239	$ (54,118)	$ (2,452)