OPERATING SEGMENTS (Tables)

6 Months Ended

Jun. 30, 2018

OPERATING SEGMENTS

Summary of financial information of our reportable segments

	Three Months Ended June 30, 2018
			Field &
	Environmental		Industrial
$s in thousands	Services		Services		Corporate		Total
Revenue	$	98,960	$	37,952	$	—	$	136,912
Depreciation, amortization and accretion	$	8,676	$	1,415	$	330	$	10,421
Capital expenditures	$	4,935	$	1,849	$	618	$	7,402
Total assets	$	599,706	$	126,797	$	98,160	$	824,663

	Three Months Ended June 30, 2017
			Field &
	Environmental		Industrial
$s in thousands	Services		Services		Corporate		Total
Revenue	$	89,591	$	36,466	$	—	$	126,057
Depreciation, amortization and accretion	$	9,105	$	1,451	$	128	$	10,684
Capital expenditures	$	7,771	$	1,839	$	723	$	10,333
Total assets	$	608,207	$	124,466	$	56,773	$	789,446

	Six Months Ended June 30, 2018
			Field &
	Environmental		Industrial
$s in thousands	Services		Services		Corporate		Total
Revenue	$	185,431	$	71,540	$	—	$	256,971
Depreciation, amortization and accretion	$	17,186	$	2,770	$	446	$	20,402
Capital expenditures	$	10,939	$	2,887	$	1,134	$	14,960
Total assets	$	599,706	$	126,797	$	98,160	$	824,663

	Six Months Ended June 30, 2017
			Field &
	Environmental		Industrial
$s in thousands	Services		Services		Corporate		Total
Revenue	$	170,894	$	65,397	$	—	$	236,291
Depreciation, amortization and accretion	$	17,895	$	2,909	$	258	$	21,062
Capital expenditures	$	13,610	$	2,339	$	1,603	$	17,552
Total assets	$	608,207	$	124,466	$	56,773	$	789,446

Reconciliation of Net Income to Adjusted EBITDA and adjusted EBITDA by operating segment

	Three Months Ended June 30,				Six Months Ended June 30,
$s in thousands	2018		2017		2018		2017
Net income	$	13,220	$	5,049	$	22,463	$	10,234
Income tax expense		4,258		2,718		7,778		5,797
Interest expense		2,907		8,474		5,716		12,604
Interest income		(39)		(21)		(63)		(31)
Foreign currency (gain) loss		139		(158)		153		(246)
Other income		(193)		(166)		(2,316)		(303)
Depreciation and amortization of plant and equipment		7,044		6,987		13,649		13,621
Amortization of intangibles		2,296		2,615		4,598		5,286
Stock-based compensation		1,011		1,043		2,079		1,959
Accretion and non-cash adjustment of closure & post-closure liabilities		1,081		1,082		2,155		2,155
Adjusted EBITDA	$	31,724	$	27,623	$	56,212	$	51,076

	Three Months Ended June 30,				Six Months Ended June 30,
$s in thousands	2018		2017		2018		2017
Adjusted EBITDA:
Environmental Services	$	39,860	$	34,642	$	74,532	$	66,498
Field & Industrial Services		4,562		4,119		6,907		6,183
Corporate		(12,698)		(11,138)		(25,227)		(21,605)
Total	$	31,724	$	27,623	$	56,212	$	51,076

Schedule of long-lived assets by geographic location

	June 30,		December 31,
$s in thousands	2018		2017
United States	$	390,769	$	396,066
Canada		58,487		61,178
Total long-lived assets	$	449,256	$	457,244