CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current Assets:
Cash and cash equivalents	$ 22,971	$ 73,940
Receivables, net	135,261	43,636
Prepaid expenses and other current assets	11,984	3,612
Income taxes receivable	6,181
Deferred income taxes	2,813	1,340
Total current assets	179,210	122,528
Property and equipment, net	227,684	114,859
Restricted cash and investments	5,729	4,097
Intangible assets, net	278,667	36,832
Goodwill	217,172	21,693
Other assets	11,308	547
Deferred income taxes	85
Total assets	919,855	300,556
Current Liabilities:
Accounts payable	24,513	7,277
Deferred revenue	13,190	8,870
Accrued liabilities	35,524	8,691
Accrued salaries and benefits	13,322	6,957
Income taxes payable	4,124	4,428
Current portion of closure and post-closure obligations	5,359	949
Current portion of long-term debt	3,828
Total current liabilities	99,860	37,172
Long-term closure and post-closure obligations	67,511	16,519
Long-term debt	390,825
Other long-term liabilities	4,336	69
Unrecognized tax benefits		480
Deferred income taxes	105,986	14,778
Total liabilities	668,518	69,018
Commitments and contingencies
Stockholders' Equity:
Common stock $0.01 par value, 50,000 authorized; 21,632 and 21,538 shares issued, respectively	216	215
Additional paid-in capital	165,524	162,830
Retained earnings	93,301	70,597
Treasury stock, at cost, 1 and 19 shares, respectively	(18)	(319)
Accumulated other comprehensive income (loss)	(7,686)	(1,785)
Total stockholders' equity	251,337	231,538
Total liabilities and stockholders' equity	$ 919,855	$ 300,556