CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Current Assets:
Cash and cash equivalents	$ 4,378	$ 2,120
Receivables, net	40,794	33,947
Prepaid expenses and other current assets	4,076	3,161
Deferred income taxes	888	1,276
Total current assets	50,136	40,504
Property and equipment, net	115,284	109,792
Restricted cash	4,111	4,111
Intangible assets, net	38,354	40,771
Goodwill	22,359	23,105
Other assets	487	411
Total assets	230,731	218,694
Current Liabilities:
Accounts payable	8,070	6,333
Deferred revenue	6,439	3,919
Accrued liabilities	8,291	7,322
Accrued salaries and benefits	5,925	7,570
Income taxes payable	3,168	426
Current portion of closure and post-closure obligations	894	1,913
Total current liabilities	32,787	27,483
Long-term closure and post-closure obligations	16,286	15,449
Reducing revolving line of credit	35,500	45,000
Other long-term liabilities	80	114
Unrecognized tax benefits	477	467
Deferred income taxes	15,693	18,159
Total liabilities	100,823	106,672
Commitments and contingencies
Stockholders' Equity:
Common stock $0.01 par value, 50,000 authorized; 18,534 and 18,385 shares issued, respectively	185	184
Additional paid-in capital	65,838	63,969
Retained earnings	64,723	48,424
Treasury stock, at cost, 19 and 71 shares, respectively	(319)	(1,183)
Accumulated other comprehensive income (loss)	(519)	628
Total stockholders' equity	129,908	112,022
Total liabilities and stockholders' equity	$ 230,731	$ 218,694