CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
Revenues	$ 154,016	$ 144,670	$ 287,818	$ 270,103
Operating expenses:
Cost of operations	102,519	95,188	197,063	185,606
General and administration	18,794	18,084	37,638	36,672
Depreciation and amortization	15,868	15,802	29,717	30,255
Southbridge landfill closure charge	64,114	0	64,114	0
Total operating expenses	201,295	129,074	328,532	252,533
Operating (loss) income	(47,279)	15,596	(40,714)	17,570
Other expense (income):
Interest income	(52)	(60)	(121)	(164)
Interest expense	6,334	10,004	12,784	20,034
Loss on debt extinguishment	46	593	517	545
Other income	(326)	(363)	(405)	(504)
Other expense, net	6,002	10,174	12,775	19,911
(Loss) income before income taxes	(53,281)	5,422	(53,489)	(2,341)
Provision for income taxes	394	230	411	81
Net (loss) income	(53,675)	5,192	(53,900)	(2,422)
Less: Net loss attributable to noncontrolling interests	0	(3)	0	(9)
Net (loss) income attributable to common stockholders	$ (53,675)	$ 5,195	$ (53,900)	$ (2,413)
Basic earnings per share attributable to common stockholders:
Weighted average common shares outstanding (in shares)	41,811	41,132	41,698	41,064
Basic earnings per common share (in dollars per share)	$ (1.28)	$ 0.13	$ (1.29)	$ (0.06)
Diluted earnings per share attributable to common stockholders:
Weighted average common shares outstanding (in shares)	41,811	41,598	41,698	41,064
Diluted earnings per common share (in dollars per share)	$ (1.28)	$ 0.12	$ (1.29)	$ (0.06)