CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities:
Net income	$ 23,534	$ 22,463
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of property and equipment	17,254	13,649
Amortization of intangible assets	5,674	4,598
Accretion of closure and post-closure obligations	2,258	2,155
Property and equipment impairment charges	25
Unrealized foreign currency loss (gain)	(502)	1,222
Deferred income taxes	3,690	27
Share-based compensation expense	2,467	2,079
Unrecognized tax benefits	131
Net loss (gain) on disposition of assets	(142)	11
Gain on insurance proceeds from damaged property and equipment	(9,153)
Amortization of debt issuance costs	409	405
Changes in assets and liabilities:
Receivables	(5,346)	(2,087)
Income taxes receivable	452	(2,851)
Other assets	(1,384)	88
Accounts payable and accrued liabilities	404	10,286
Deferred revenue	2,418	1,770
Accrued salaries and benefits	(2,025)	(2,317)
Income taxes payable	(515)	(2,905)
Closure and post-closure obligations	(775)	(583)
Net cash provided by operating activities	38,874	48,010
Cash flows from investing activities:
Purchases of property and equipment	(24,657)	(14,960)
Insurance proceeds from damaged property and equipment	9,500
Proceeds from sale of property and equipment	512	141
Purchases of restricted investments	(400)	(498)
Proceeds from sale of restricted investments	354	431
Net cash used in investing activities	(14,691)	(14,886)
Cash flows from financing activities:
Payments on long-term debt	(30,000)
Payments on short-term borrowings	(14,384)
Proceeds from short-term borrowings	14,384
Dividends paid	(7,942)	(7,884)
Payment of equipment financing obligations	(408)	(217)
Proceeds from exercise of stock options		1,471
Other	(914)	(312)
Net cash used in financing activities	(39,264)	(6,942)
Effect of foreign exchange rate changes on cash	836	(902)
Increase (decrease) in Cash and cash equivalents and restricted cash	(14,245)	25,280
Cash and cash equivalents and restricted cash at beginning of period	32,753	28,799
Cash and cash equivalents and restricted cash at end of period	18,508	54,079
Supplemental Disclosures:
Income taxes paid, net of receipts	5,694	13,625
Interest paid	6,850	5,288
Non-cash investing and financing activities:
Capital expenditures in accounts payable	834	493
Restricted stock issued from treasury shares	$ 451	$ 11