Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
CURRENT ASSETS:
Cash and cash equivalents	$ 30,337	$ 59,727
Accounts receivable, net	386,059	357,278
Materials and supplies	44,936	30,251
Prepaid expenses and other	43,448	24,176
Deferred income tax assets, net	51,942	76,994
Total current assets	556,722	548,426
PROPERTY AND EQUIPMENT, net	4,104,092	3,788,482
GOODWILL	964,882	628,815
INTANGIBLE ASSETS, net	1,137,170	587,663
DEFERRED INCOME TAX ASSETS, net	2,182	2,500
OTHER ASSETS, net	41,318	39,867
Total assets	6,806,366	5,595,753
CURRENT LIABILITIES:
Current portion of long-term debt	25,507	67,398
Accounts payable	317,554	290,746
Accrued expenses	143,462	106,094
Total current liabilities	486,523	464,238
LONG-TERM DEBT, less current portion	2,341,778	1,548,051
DEFERRED INCOME TAX LIABILITIES, net	1,086,808	908,852
DEFERRED ITEMS - grants from outside parties	281,732	279,286
OTHER LONG-TERM LIABILITIES	$ 177,235	$ 37,346
COMMITMENTS AND CONTINGENCIES
EQUITY:
Additional paid-in capital	$ 1,344,373	$ 1,334,474
Retained earnings	1,396,380	1,319,639
Accumulated other comprehensive loss	(81,593)	(72,252)
Treasury stock, at cost	(227,538)	(224,547)
Total equity	2,432,290	2,357,980
Total liabilities and equity	6,806,366	5,595,753
Class A Common Stock, $0.01 par value, one vote per share; 180,000,000 shares authorized at June 30, 2015 and December 31, 2014; 65,966,791 and 65,632,309 shares issued and 53,242,722 and 52,938,267 shares outstanding (net of 12,724,069 and 12,694,042 shares in treasury) on June 30, 2015 and December 31, 2014, respectively
EQUITY:
Common Stock	660	656
Class B Common Stock, $0.01 par value, ten votes per share; 30,000,000 shares authorized at June 30, 2015 and December 31, 2014; 843,892 and 1,020,485 shares issued and outstanding on June 30, 2015 and December 31, 2014, respectively
EQUITY:
Common Stock	$ 8	$ 10