ACQUISITION (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Business Acquisition [Line Items]
Revenues Contributed By Acquired Entity	$ 130,600,000		$ 493,400,000
Net income (loss) contributed by acquire entity	(1,500,000)		35,900,000
Final indebtedness and working capital adjustment			11,200,000
Net purchase price	906,700,000		906,700,000
Period after Acquisition to finalize the allocation of consideration transferred			1
Allocation of purchase price [Abstract]
Current assets	310,800,000		310,800,000
Noncurrent assets	1,418,900,000		1,418,900,000
Current liabilities	(167,900,000)		(167,900,000)
Long-term debt	(397,400,000)		(397,400,000)
Other noncurrent liabilities	(559,100,000)		(559,100,000)
Preferred stock	(800,000)		(800,000)
Total identifiable net assets	604,500,000		604,500,000
Goodwill	302,200,000		302,200,000
Total Purchase Price, Net	906,700,000		906,700,000
Increase in goodwill due to finalizing purchase price allocation			3,300,000
Increase in goodwill due to working capital adjustment			1,600,000
Increase in goodwill due to adjustments to the values of assets and liabilities recognized			1,700,000
Pro forma information [Abstract]
Pro forma operating revenues		321,237,000		874,429,000
Pro forma operating expenses		551,216,000		1,008,264,000
Pro forma net income (loss)		(257,271,000)		(209,707,000)
Pro forma earnings per share of common stock - basic (in dollars per share)		$ (5.09)		$ (4.15)
Pro-forma net income, excluding goodwill impairment charges		$ 13,900,000		$ 61,500,000
Pro-forma earnings per share, excluding goodwill impairment charges		$ 0.28		$ 1.22