CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current Assets:
Cash and cash equivalents	$ 67,487	$ 73,848
Receivables, net	250,154	241,978
Prepaid expenses and other current assets	32,136	28,379
Income taxes receivable	14,441	18,279
Total current assets	364,218	362,484
Property and equipment, net	456,384	456,637
Operating lease assets	43,607	51,474
Restricted cash and investments	1,567	5,598
Intangible assets, net	489,573	523,988
Goodwill	413,126	413,037
Other assets	36,923	18,065
Total assets	1,805,398	1,831,283
Current Liabilities:
Accounts payable	64,793	35,881
Deferred revenue	15,950	15,267
Accrued liabilities	51,265	59,296
Accrued salaries and benefits	29,438	30,918
Income taxes payable	559	977
Current portion of long-term debt	3,359	3,359
Current portion of closure and post-closure obligations	5,771	6,471
Current portion of operating lease liabilities	15,799	17,048
Total current liabilities	186,934	169,217
Long-term debt	735,125	782,484
Long-term closure and post-closure obligations	93,149	89,398
Long-term operating lease liabilities	28,477	35,069
Other long-term liabilities	13,907	32,201
Deferred income taxes, net	123,482	120,983
Total liabilities	1,181,074	1,229,352
Commitments and contingencies (See Note 18)
Stockholders' Equity:
Common stock $0.01 par value per share, 50,000 authorized; 31,512 shares issued and outstanding	315	315
Additional paid-in capital	821,970	820,567
Retained deficit	(183,115)	(188,452)
Treasury stock, at cost, 242 and 358 shares, respectively	(10,652)	(15,841)
Accumulated other comprehensive loss	(4,194)	(14,658)
Total stockholders' equity	624,324	601,931
Total liabilities and stockholders' equity	$ 1,805,398	$ 1,831,283