CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities:
Net income	$ 7,517	$ 5,865
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of property and equipment	5,904	7,479
Amortization of intangible assets	2,610	3,302
Accretion of closure and post-closure obligations	1,024	1,035
Unrealized foreign currency (gain) loss	(846)	1,754
Deferred income taxes	(699)	(1,193)
Share-based compensation expense	795	463
Net (gain) loss on disposal of property and equipment	(17)	953
Amortization of debt issuance costs	638	500
Amortization of debt discount	37	37
Changes in assets and liabilities:
Receivables	12,222	14,143
Income taxes receivable	943	2,229
Other assets	365	1,560
Accounts payable and accrued liabilities	571	(6,281)
Deferred revenue	(1,461)	(4,393)
Accrued salaries and benefits	(2,122)	(3,256)
Income taxes payable	3,243	(981)
Closure and post-closure obligations	(472)	(583)
Net cash provided by operating activities	30,252	22,633
Cash flows from investing activities:
Purchases of property and equipment	(7,219)	(9,231)
Purchases of restricted cash and investments	(53)	(816)
Proceeds from sale of restricted cash and investments	6	790
Proceeds from sale of property and equipment	56	160
Net cash used in investing activities	(7,210)	(9,097)
Cash flows from financing activities:
Payments on long-term debt	(10,764)	(21,994)
Dividends paid	(3,918)	(3,894)
Proceeds from revolving credit facility	6,934
Payments on revolving credit facility	(6,934)
Proceeds from exercise of stock options		126
Other	(225)	(255)
Net cash used in financing activities	(14,907)	(26,017)
Effect of foreign exchange rate changes on cash	158	(293)
Increase (decrease) in cash and cash equivalents	8,293	(12,774)
Cash and cash equivalents at beginning of period	5,989	22,971
Cash and cash equivalents at end of period	14,282	10,197
Supplemental Disclosures
Income taxes paid, net of receipts	1,230	3,241
Interest paid	3,880	4,979
Non-cash investing and financing activities:
Capital expenditures in accounts payable	2,511	2,112
Restricted stock issued from treasury shares	$ 155	$ 272