CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current Assets:
Cash and cash equivalents	$ 44,251	$ 27,042
Receivables, net	95,642	110,777
Prepaid expenses and other current assets	9,943	9,138
Income taxes receivable	565
Total current assets	150,401	146,957
Property and equipment, net	232,352	234,432
Restricted cash and investments	5,793	5,802
Intangible assets, net	219,806	222,812
Goodwill	188,883	189,373
Other assets	3,850	2,700
Total assets	801,085	802,076
Current Liabilities:
Accounts payable	11,380	14,868
Deferred revenue	8,793	8,532
Accrued liabilities	20,715	22,888
Accrued salaries and benefits	11,763	14,242
Income taxes payable	3,149	2,970
Current portion of closure and post-closure obligations	2,333	2,330
Total current liabilities	58,133	65,830
Long-term closure and post-closure obligations	74,490	73,758
Long-term debt	277,000	277,000
Other long-term liabilities	3,082	3,828
Deferred income taxes, net	58,233	57,583
Total liabilities	470,938	477,999
Commitments and contingencies
Stockholders' Equity:
Common stock $0.01 par value, 50,000 authorized; 21,931 and 21,849 shares issued, respectively	219	218
Additional paid-in capital	178,840	177,498
Retained earnings	160,838	155,533
Treasury stock, at cost, 8 and 3 shares, respectively	(370)	(68)
Accumulated other comprehensive loss	(9,380)	(9,104)
Total stockholders' equity	330,147	324,077
Total liabilities and stockholders' equity	$ 801,085	$ 802,076