Supplemental Condensed Consolidating Financial Information (Details 3) (USD $) In Thousands, unless otherwise specified	1 Months Ended	9 Months Ended
	Jan. 31, 2013	Sep. 30, 2013	Sep. 30, 2012
Condensed Consolidating Statements of Cash Flows
Net cash (used in) provided by operating activities		$ 330,659	$ 385,784
Cash flows from investing activities:
Restricted cash		15,500	1,003
Capital expenditures		(2,176,719)	(1,239,705)
Investment in unconsolidated affiliates		(8,530)	(839)
Acquisition of business, net of cash acquired		(225,210)	(506,797)
Proceeds from disposal of property, plant and equipment		208,652	589
Net cash flows used in investing activities		(2,186,307)	(1,745,749)
Cash flows from financing activities:
Proceeds from public equity offerings, net		1,039,849	1,191,066
Proceeds from long-term debt		1,000,000	742,613
Payments of long-term debt		(501,112)
Payments of premiums on redemption of long-term debt	(31,500)	(31,516)
Payments for debt issuance costs, deferred financing costs and registration costs		(14,046)	(14,184)
Contributions from non-controlling interest		685,219	56,101
Share-based payment activity		(4,562)	(5,845)
Payments of distributions		(334,126)	(244,240)
Payments of SMR liability		(1,661)	(1,525)
Proceeds from Credit Facility			511,100
Payments of Credit Facility			(577,100)
Net cash flows provided by financing activities		1,838,045	1,657,986
Net (decrease) increase in cash and cash equivalents		(17,603)	298,021
Cash and cash equivalents at beginning of year	345,756	345,756	114,332
Cash and cash equivalents at end of period		328,153	412,353
Reportable legal entities | Parent
Condensed Consolidating Statements of Cash Flows
Net cash (used in) provided by operating activities		(136,817)	(89,558)
Cash flows from investing activities:
Capital expenditures		(655)	(120)
Equity investments in consolidated affiliates		(43,763)	(42,120)
Distributions from consolidated affiliates		72,673	48,973
Collection of intercompany notes, net			(12,300)
Net cash flows used in investing activities		28,255	(5,567)
Cash flows from financing activities:
Proceeds from public equity offerings, net		1,039,849	1,191,066
Proceeds from long-term debt		1,000,000	742,613
Payments of long-term debt		(501,112)
Payments of premiums on redemption of long-term debt		(31,516)
Payments for debt issuance costs, deferred financing costs and registration costs		(14,046)	(14,184)
Share-based payment activity		(5,212)	(8,061)
Payments of distributions		(333,946)	(244,169)
Intercompany advances, net		(1,074,257)	(1,206,149)
Proceeds from Credit Facility			511,100
Payments of Credit Facility			(577,100)
Net cash flows provided by financing activities		79,760	395,116
Net (decrease) increase in cash and cash equivalents		(28,802)	299,991
Cash and cash equivalents at beginning of year	210,015	210,015	22
Cash and cash equivalents at end of period		181,213	300,013
Reportable legal entities | Guarantor Subsidiaries
Condensed Consolidating Statements of Cash Flows
Net cash (used in) provided by operating activities		265,484	305,694
Cash flows from investing activities:
Capital expenditures		(110,921)	(236,153)
Equity investments in consolidated affiliates		(1,404,800)	(1,367,484)
Investment in unconsolidated affiliates		(8,530)
Distributions from consolidated affiliates		455,966	95,814
Acquisition of business, net of cash acquired		(225,210)
Proceeds from disposal of property, plant and equipment		582	1,718
Net cash flows used in investing activities		(1,292,913)	(1,506,105)
Cash flows from financing activities:
Payments related to intercompany financing, net			12,300
Contributions from parent and affiliates		43,763	42,120
Share-based payment activity		650	2,216
Payments of distributions		(72,673)	(48,973)
Payments of SMR liability		(1,661)	(1,525)
Intercompany advances, net		1,074,257	1,206,149
Net cash flows provided by financing activities		1,044,336	1,212,287
Net (decrease) increase in cash and cash equivalents		16,907	11,876
Cash and cash equivalents at beginning of year	102,979	102,979	99,580
Cash and cash equivalents at end of period		119,886	111,456
Reportable legal entities | Non-Guarantor Subsidiaries
Condensed Consolidating Statements of Cash Flows
Net cash (used in) provided by operating activities		188,042	170,976
Cash flows from investing activities:
Restricted cash		15,500	1,003
Capital expenditures		(2,049,794)	(1,005,270)
Acquisition of business, net of cash acquired			(506,797)
Proceeds from disposal of property, plant and equipment		208,070	84
Net cash flows used in investing activities		(1,826,224)	(1,510,980)
Cash flows from financing activities:
Payments related to intercompany financing, net		(1,399)	(703)
Contributions from parent and affiliates		1,404,800	1,366,645
Contributions from non-controlling interest		685,219	56,101
Payments of distributions		(456,146)	(95,885)
Net cash flows provided by financing activities		1,632,474	1,326,158
Net (decrease) increase in cash and cash equivalents		(5,708)	(13,846)
Cash and cash equivalents at beginning of year	32,762	32,762	14,730
Cash and cash equivalents at end of period		27,054	884
Consolidating Adjustments
Condensed Consolidating Statements of Cash Flows
Net cash (used in) provided by operating activities		13,950	(1,328)
Cash flows from investing activities:
Capital expenditures		(15,349)	1,838
Equity investments in consolidated affiliates		1,448,563	1,408,765
Distributions from consolidated affiliates		(528,639)	(144,787)
Collection of intercompany notes, net			12,300
Proceeds from disposal of property, plant and equipment			(1,213)
Net cash flows used in investing activities		904,575	1,276,903
Cash flows from financing activities:
Payments related to intercompany financing, net		1,399	(11,597)
Contributions from parent and affiliates		(1,448,563)	(1,408,765)
Payments of distributions		528,639	144,787
Net cash flows provided by financing activities		$ (918,525)	$ (1,275,575)