Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 67,230	$ 78,458
Trade accounts receivable, net of allowance of $1,612 and $1,230, respectively	249,125	254,446
Accounts receivable - related parties	73	65
Income tax receivable		314
Inventories	37,924	34,963
Prepaid expenses	10,904	8,667
Other current assets	8,626	6,768
Deferred tax assets	24,474	39,154
Total current assets	398,356	422,835
Property and equipment, net	881,327	856,412
Deferred debt costs, net of amortization	15,439	16,131
Goodwill	82,579	82,571
Other intangible assets, net of amortization	71,807	74,637
Other assets	8,189	7,342
Total assets	1,457,697	1,459,928
Current liabilities:
Accounts payable	38,897	56,957
Accrued expenses	65,500	65,096
Income tax payable	303
Current portion of long-term debt	33,976	34,115
Other current liabilities	590	315
Total current liabilities	139,266	156,483
Long-term debt, net of unamortized premium on notes of $1,842 and $1,892, respectively	747,760	748,976
Deferred tax liabilities	180,240	183,551
Other long-term liabilities	12,137	11,215
Commitments and contingencies
Stockholders' equity:
Preferred stock; $.01 par value; 5,000,000 shares authorized; none designated or issued at March 31, 2012 and December 31, 2011
Common stock; $.01 par value; 80,000,000 shares authorized; 43,500,032 shares issued, and 43,258,808 shares outstanding at March 31, 2012; 42,530,809 shares issued, and 42,486,645 shares outstanding at December 31, 2011	435	425
Additional paid-in capital	347,852	345,619
Retained earnings	33,290	13,659
Treasury stock, at cost, 241,224 and 44,164 shares at March 31, 2012 and December 31, 2011, respectively	(3,283)	0
Total stockholders' equity	378,294	359,703
Total liabilities and stockholders' equity	$ 1,457,697	$ 1,459,928