Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
CURRENT ASSETS:
Cash and cash equivalents	$ 112,420	$ 59,727
Accounts receivable, net	394,132us-gaap_AccountsReceivableNetCurrent	357,278us-gaap_AccountsReceivableNetCurrent
Materials and supplies	43,183us-gaap_MaterialsSuppliesAndOther	30,251us-gaap_MaterialsSuppliesAndOther
Prepaid expenses and other	51,294	24,176
Deferred income tax assets, net	76,721	76,994
Total current assets	677,750us-gaap_AssetsCurrent	548,426us-gaap_AssetsCurrent
PROPERTY AND EQUIPMENT, net	4,014,856us-gaap_PropertyPlantAndEquipmentNet	3,788,482us-gaap_PropertyPlantAndEquipmentNet
GOODWILL	907,440us-gaap_Goodwill	628,815us-gaap_Goodwill
INTANGIBLE ASSETS, net	1,112,740	587,663
DEFERRED INCOME TAX ASSETS, net	2,205	2,500
OTHER ASSETS, net	42,634us-gaap_OtherAssetsNoncurrent	39,867us-gaap_OtherAssetsNoncurrent
Total assets	6,757,625us-gaap_Assets	5,595,753us-gaap_Assets
CURRENT LIABILITIES:
Current portion of long-term debt	35,963	67,398
Accounts payable	318,219us-gaap_AccountsPayableCurrent	290,746us-gaap_AccountsPayableCurrent
Accrued expenses	153,762us-gaap_AccruedLiabilitiesCurrent	106,094us-gaap_AccruedLiabilitiesCurrent
Total current liabilities	507,944us-gaap_LiabilitiesCurrent	464,238us-gaap_LiabilitiesCurrent
LONG-TERM DEBT, less current portion	2,410,340	1,548,051
DEFERRED INCOME TAX LIABILITIES, net	1,096,457	908,852
DEFERRED ITEMS - grants from outside parties	276,950us-gaap_OtherDeferredCreditsNoncurrent	279,286us-gaap_OtherDeferredCreditsNoncurrent
OTHER LONG-TERM LIABILITIES	132,414us-gaap_OtherLiabilitiesNoncurrent	37,346us-gaap_OtherLiabilitiesNoncurrent
COMMITMENTS AND CONTINGENCIES
EQUITY:
Additional paid-in capital	1,341,960us-gaap_AdditionalPaidInCapital	1,334,474us-gaap_AdditionalPaidInCapital
Retained earnings	1,343,543	1,319,639
Accumulated other comprehensive loss	(125,257)	(72,252)
Treasury stock, at cost	(227,393)us-gaap_TreasuryStockValue	(224,547)us-gaap_TreasuryStockValue
Total equity	2,333,520	2,357,980
Total liabilities and equity	6,757,625	5,595,753
Class A Common Stock, $0.01 par value, one vote per share; 180,000,000 shares authorized at March 31, 2015 and December 31, 2014; 65,797,851 and 65,632,309 shares issued and 53,075,305 and 52,938,267 shares outstanding (net of 12,722,546 and 12,694,042 shares in treasury) on March 31, 2015 and December 31, 2014, respectively
EQUITY:
Common Stock	658	656
Class B Common Stock, $0.01 par value, ten votes per share; 30,000,000 shares authorized at March 31, 2015 and December 31, 2014; 945,485 and 1,020,485 shares issued and outstanding on March 31, 2015 and December 31, 2014, respectively
EQUITY:
Common Stock	$ 9	$ 10

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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