Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 134,565	$ 78,458
Trade accounts receivable, net of allowance of $2,780 and $1,230, respectively	209,100	254,446
Accounts receivable - related parties	52	65
Income tax receivable	2,553	314
Inventories	40,230	34,963
Prepaid expenses	8,796	8,667
Other current assets	13,891	6,768
Deferred tax assets	29,113	39,154
Total current assets	438,300	422,835
Property and equipment, net	943,766	856,412
Deferred debt costs, net of amortization	18,733	16,131
Goodwill	105,836	82,571
Other intangible assets, net of amortization	82,762	74,637
Other assets	6,521	7,342
Total assets	1,595,918	1,459,928
Current liabilities:
Accounts payable	61,740	56,957
Accrued expenses	77,716	65,096
Current portion of long-term debt	38,235	34,115
Other current liabilities	306	315
Total current liabilities	177,997	156,483
Long-term debt, net of discount or premium on notes of $1,683 and $1,892 at December 31, 2012 and 2011, respectively	844,906	748,976
Deferred tax liabilities	185,101	183,551
Other long-term liabilities	13,667	11,215
Commitments and contingencies
Stockholders' equity:
Preferred stock; $.01 par value; 5,000,000 shares authorized; none designated or issued at December 31, 2012 and December 31, 2011, respectively
Common stock; $.01 par value; 80,000,000 shares authorized; 43,500,032 shares issued and 41,721,229 shares outstanding at December 31, 2012; and 42,530,809 shares issued and 42,486,645 shares outstanding at December 31, 2011	435	425
Additional paid-in capital	355,687	345,619
Retained earnings	34,513	13,659
Treasury stock, at cost 1,778,803 and 44,164 shares at December 31, 2012 and 2011, respectively	(16,388)
Total stockholders' equity	374,247	359,703
Total liabilities and stockholder's equity	$ 1,595,918	$ 1,459,928