Supplemental Condensed Consolidating Financial Information (Details 3) (USD $) In Thousands, unless otherwise specified	1 Months Ended	6 Months Ended
	Jan. 31, 2013	Jun. 30, 2013	Jun. 30, 2012
Condensed Consolidating Statements of Cash Flows
Net cash (used in) provided by operating activities		$ 177,596	$ 253,621
Cash flows from investing activities:
Restricted cash		25,500	1,003
Capital expenditures		(1,435,084)	(580,980)
Investment in unconsolidated affiliate		(8,336)	(839)
Distributions from consolidated affiliates		0
Acquisition of business, net of cash acquired		(225,210)	(506,797)
Proceeds from disposal of property, plant and equipment		208,109	499
Net cash flows used in investing activities		(1,435,021)	(1,087,114)
Cash flows from financing activities:
Proceeds from public equity offering, net		348,352	852,873
Proceeds from long-term debt		1,000,000
Payments of long-term debt		(501,112)
Payments of premiums on redemption of long-term debt	(31,500)	(31,516)
Payments for debt issue costs and deferred financing costs		(14,046)	(2,315)
Contribution from non-controlling interest		685,219	1,101
Share-based payment activity		(4,556)	(5,841)
Payment of distributions		(215,015)	(155,144)
Payments of SMR liability		(1,103)	(1,005)
Proceeds from Credit Facility			238,065
Payments of Credit Facility			(86,200)
Net cash flows provided by financing activities		1,266,223	841,534
Net increase in cash and cash equivalents		8,798	8,041
Cash and cash equivalents at beginning of year	345,756	345,756	114,332
Cash and cash equivalents at end of period		354,554	122,373
Parent
Condensed Consolidating Statements of Cash Flows
Net cash (used in) provided by operating activities		(79,362)	(77,181)
Cash flows from investing activities:
Capital expenditures		(480)	(114)
Equity investments in consolidated affiliates		(28,823)	(26,640)
Distributions from consolidated affiliates		47,860	36,575
Collection of intercompany notes, net			16,700
Net cash flows used in investing activities		18,557	26,521
Cash flows from financing activities:
Proceeds from public equity offering, net		348,352	852,873
Proceeds from long-term debt		1,000,000
Payments of long-term debt		(501,112)
Payments of premiums on redemption of long-term debt		(31,516)
Payments for debt issue costs and deferred financing costs		(14,046)	(2,315)
Share-based payment activity		(5,206)	(8,048)
Payment of distributions		(214,903)	(155,073)
Intercompany advances, net		(595,591)	(788,664)
Proceeds from Credit Facility			238,065
Payments of Credit Facility			(86,200)
Net cash flows provided by financing activities		(14,022)	50,638
Net increase in cash and cash equivalents		(74,827)	(22)
Cash and cash equivalents at beginning of year	210,015	210,015	22
Cash and cash equivalents at end of period		135,188
Guarantor Subsidiaries
Condensed Consolidating Statements of Cash Flows
Net cash (used in) provided by operating activities		129,228	214,781
Cash flows from investing activities:
Capital expenditures		(53,319)	(166,926)
Equity investments in consolidated affiliates		(783,600)	(843,960)
Investment in unconsolidated affiliate		(8,336)
Distributions from consolidated affiliates		389,300	50,489
Acquisition of business, net of cash acquired		(225,210)
Proceeds from disposal of property, plant and equipment		43	1,713
Net cash flows used in investing activities		(681,122)	(958,684)
Cash flows from financing activities:
Payments related to intercompany financing, net			(16,700)
Contributions from parent and affiliates		28,823	26,640
Share-based payment activity		650	2,207
Payment of distributions		(47,860)	(36,575)
Payments of SMR liability		(1,103)	(1,005)
Intercompany advances, net		595,591	788,664
Net cash flows provided by financing activities		576,101	763,231
Net increase in cash and cash equivalents		24,207	19,328
Cash and cash equivalents at beginning of year	102,979	102,979	99,580
Cash and cash equivalents at end of period		127,186	118,908
Non-Guarantor Subsidiaries
Condensed Consolidating Statements of Cash Flows
Net cash (used in) provided by operating activities		116,760	116,298
Cash flows from investing activities:
Restricted cash		25,500	1,003
Capital expenditures		(1,369,397)	(415,154)
Acquisition of business, net of cash acquired			(506,797)
Proceeds from disposal of property, plant and equipment		208,066
Net cash flows used in investing activities		(1,135,831)	(920,948)
Cash flows from financing activities:
Payments related to intercompany financing, net		(918)	(277)
Contributions from parent and affiliates		783,600	843,121
Contribution from non-controlling interest		685,219	1,101
Payment of distributions		(389,412)	(50,560)
Net cash flows provided by financing activities		1,078,489	793,385
Net increase in cash and cash equivalents		59,418	(11,265)
Cash and cash equivalents at beginning of year	32,762	32,762	14,730
Cash and cash equivalents at end of period		92,180	3,465
Consolidating Adjustments
Condensed Consolidating Statements of Cash Flows
Net cash (used in) provided by operating activities		10,970	(277)
Cash flows from investing activities:
Capital expenditures		(11,888)	1,214
Equity investments in consolidated affiliates		812,423	869,761
Distributions from consolidated affiliates		(437,160)	(87,064)
Collection of intercompany notes, net			(16,700)
Proceeds from disposal of property, plant and equipment			(1,214)
Net cash flows used in investing activities		363,375	765,997
Cash flows from financing activities:
Payments related to intercompany financing, net		918	16,977
Contributions from parent and affiliates		(812,423)	(869,761)
Payment of distributions		437,160	87,064
Net cash flows provided by financing activities		$ (374,345)	$ (765,720)