Segment Information (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Segment information
Income from operations	$ 55,626	$ 140,022	$ 127,627	$ 203,685
Selling, general and administrative expenses	(27,701)	(25,499)	(62,991)	(50,741)
Depreciation	(104,078)	(71,562)	(206,007)	(139,579)
Amortization of intangible assets	(15,965)	(17,092)	(31,943)	(31,922)
Loss (gain) on disposal of property, plant and equipment	1,450	(37,736)	1,357	(37,598)
Accretion of asset retirement obligations	(168)	(157)	(336)	(509)
Equity in (loss) earnings from unconsolidated affiliates	(721)	430	(471)	665
Interest income	10	62	19	211
Interest expense	(43,391)	(36,955)	(84,375)	(75,291)
Amortization of deferred financing costs and debt discount (a component of interest expense)	(1,449)	(1,784)	(4,273)	(3,614)
Loss on redemption of debt				(38,455)
Miscellaneous income, net	33	6	43	6
Income before provision for income tax	10,108	101,781	38,570	87,207
Total segments
Segment information
Income from operations	220,132	177,472	437,980	339,200
Portion of operating income (loss) attributable to non-controlling interests	4,693	(1,090)	7,828	(2,365)
Unallocated Segment
Segment information
Portion of operating income (loss) attributable to non-controlling interests	4,184	(1,090)	7,319	(2,365)
Derivative (loss) gain not allocated to segments	(20,762)	39,331	(16,663)	50,182
Revenue adjustment for unconsolidated affiliate	(3,833)		(3,833)
Revenue deferral adjustment and other	375	(1,437)	(1,119)	(2,801)
Compensation expense included in facility expenses not allocated to segments	(903)	(368)	(1,906)	(754)
Facility expense and purchase product cost adjustments for unconsolidated affiliate	2,598		2,598
Portion of operating loss attributable to non-controlling interests of an unconsolidated affiliate	509		509
Facility expense adjustments	2,688	2,688	5,376	5,376
Selling, general and administrative expenses	(27,701)	(25,499)	(62,991)	(50,741)
Depreciation	(104,078)	(71,562)	(206,007)	(139,579)
Amortization of intangible assets	(15,965)	(17,092)	(31,943)	(31,922)
Loss (gain) on disposal of property, plant and equipment	1,450	(37,736)	1,357	(37,598)
Accretion of asset retirement obligations	(168)	(157)	(336)	(509)
Equity in (loss) earnings from unconsolidated affiliates	(721)	430	(471)	665
Interest income	10	62	19	211
Interest expense	(43,391)	(36,955)	(84,375)	(75,291)
Amortization of deferred financing costs and debt discount (a component of interest expense)	(1,449)	(1,784)	(4,273)	(3,614)
Loss on redemption of debt				(38,455)
Miscellaneous income, net	$ 33	$ 6	$ 43	$ 6