CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Current Assets:
Cash and cash equivalents	$ 5,524	$ 4,289
Receivables, net	34,167	29,818
Prepaid expenses and other current assets	2,646	2,185
Income taxes receivable		181
Deferred income taxes	1,108	964
Total current assets	43,445	37,437
Property and equipment, net	110,758	99,975
Restricted cash	4,111	4,115
Intangible assets, net	41,594	39,238
Goodwill	23,355	21,200
Other assets	467	623
Total assets	223,730	202,588
Current Liabilities:
Accounts payable	5,574	4,669
Deferred revenue	3,867	3,574
Accrued liabilities	7,205	10,569
Accrued salaries and benefits	6,546	5,382
Income taxes payable	2,025	1,510
Current portion of closure and post-closure obligations	3,167	2,890
Current portion of long-term debt	2,301	71
Total current liabilities	30,685	28,665
Long-term closure and post-closure obligations	15,640	14,448
Reducing revolving line of credit	47,200	40,500
Other long-term liabilities	125	150
Unrecognized tax benefits	464	454
Deferred income taxes	18,064	18,208
Total liabilities	112,178	102,425
Commitments and contingencies
Stockholders' Equity:
Common stock $0.01 par value, 50,000 authorized; 18,323 and 18,320 shares issued, respectively	183	183
Additional paid-in capital	62,696	62,455
Retained earnings	48,894	39,197
Treasury stock, at cost, 71 and 93 shares, respectively	(1,183)	(1,555)
Accumulated other comprehensive income (loss)	962	(117)
Total stockholders' equity	111,552	100,163
Total liabilities and stockholders' equity	$ 223,730	$ 202,588