CONSOLIDATED BALANCE SHEETS (USD $) In Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 127,256	$ 124,281
Accounts receivable, net of allowance for doubtful accounts of $2,150 and $2,175 as of June 30, 2011 and December 31, 2010, respectively	166,771	178,179
Inventories	69,229	68,744
Deferred income taxes, current portion	2,528	2,448
Prepaid expenses, deposits and other current assets	50,095	40,013
Total current assets	415,879	413,665
Property and equipment, at cost	787,604	776,367
Less accumulated depreciation	(350,920)	(325,786)
Net Property and equipment	436,684	450,581
Goodwill, net	780,927	763,915
Intangible assets, net	78,659	70,613
Other assets and investments	502,542	452,764
Total assets	2,214,691	2,151,538
Current liabilities:
Debt payments due within one year	9,479	8,431
Accounts payable	55,872	50,642
Accrued liabilities	134,260	136,925
Total current liabilities	199,611	195,998
Deferred income taxes	63,376	60,858
Other long-term liabilities	61,344	53,765
Long-term debt, excluding current installments	1,381,335	1,388,259
Total liabilities	1,705,666	1,698,880
Commitments and contingencies
Stockholders' equity:
Class A common stock, par value $0.01 per share, 199,300 shares authorized, 97,863 and 97,474 shares issued and 92,114 and 91,725 shares outstanding as of June 30, 2011 and December 31, 2010, respectively	979	975
Additional paid-in capital	682,093	674,691
Accumulated earnings	(130,934)	(131,021)
Treasury stock, at cost, 5,749 shares held as of June 30, 2011 and December 31, 2010	(74,460)	(74,460)
Accumulated other comprehensive income (loss)	31,347	(17,527)
Total stockholders' equity	509,025	452,658
Total liabilities and stockholders' equity	$ 2,214,691	$ 2,151,538