Supplemental Condensed Consolidating Financial Information (Details 3) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Condensed Consolidating Statements of Cash Flows
Net cash (used in) provided by operating activities	$ 363,338	$ 356,823
Cash flows from investing activities:
Restricted cash	10,000
Capital expenditures	(833,062)	(1,275,323)
Investment in unconsolidated affiliates	(107,894)	(76,054)
Proceeds from disposal of property, plant and equipment	2,360	21,562
Proceeds from sale of equity interest in unconsolidated affiliate		324,657
Net cash flows used in investing activities	(928,596)	(1,005,158)
Cash flows from financing activities:
Proceeds from public equity offerings, net	39,630	711,837
Proceeds from Credit Facility	1,260,600	1,923,500
Payments of Credit Facility	(910,700)	(1,482,300)
Proceeds from long-term debt	1,848,875
Payments of long-term debt	(1,280,000)
Payments of premiums on redemption of long-term debt	(103,209)
Payments for debt issuance costs, deferred financing costs and registration costs	(20,270)	(2,045)
Proceeds from sale of equity interest in consolidated subsidiary	11,319
Contributions from non-controlling interest	26,689
Payments of SMR liability	(1,319)	(1,201)
Share-based payment activity	(6,117)	(8,943)
Payment of distributions	(363,965)	(278,406)
Net cash flows provided by financing activities	501,533	862,442
Net (decrease) increase in cash and cash equivalents	(63,725)	214,107
Cash and cash equivalents at beginning of period	108,887	85,305
Cash and cash equivalents at end of period	45,162	299,412
Reportable legal entities | Parent
Condensed Consolidating Statements of Cash Flows
Net cash (used in) provided by operating activities	(145,787)	(97,223)
Cash flows from investing activities:
Capital expenditures	(1,010)	(5,116)
Equity investments in consolidated affiliates	(36,540)	(30,038)
Intercompany advances, net	(295,602)	(808,923)
Distributions from consolidated affiliates	34,736	63,158
Investment in intercompany notes receivable, net	(45,300)	14,200
Net cash flows used in investing activities	(343,716)	(766,719)
Cash flows from financing activities:
Proceeds from public equity offerings, net	39,630	711,837
Proceeds from Credit Facility	1,260,600	1,923,500
Payments of Credit Facility	(910,700)	(1,482,300)
Proceeds from long-term debt	1,848,875
Payments of long-term debt	(1,280,000)
Payments of premiums on redemption of long-term debt	(103,209)
Payments for debt issuance costs, deferred financing costs and registration costs	(20,270)	(2,045)
Share-based payment activity	(6,117)	(8,943)
Payment of distributions	(339,306)	(278,316)
Net cash flows provided by financing activities	489,503	863,733
Net (decrease) increase in cash and cash equivalents		(209)
Cash and cash equivalents at beginning of period		224
Cash and cash equivalents at end of period		15
Reportable legal entities | Guarantor Subsidiaries
Condensed Consolidating Statements of Cash Flows
Net cash (used in) provided by operating activities	147,039	263,284
Cash flows from investing activities:
Capital expenditures	(121,624)	(108,203)
Equity investments in consolidated affiliates	(674,134)	(1,090,000)
Investment in unconsolidated affiliates	(7,071)	(8,540)
Distributions from consolidated affiliates	301,130	151,110
Proceeds from disposal of property, plant and equipment	22	4,164
Net cash flows used in investing activities	(501,677)	(1,051,469)
Cash flows from financing activities:
Payments related to intercompany financing, net	45,300	(14,200)
Contributions from Parent and affiliates	36,540	30,038
Payments of SMR liability	(1,319)	(1,201)
Payment of distributions	(34,736)	(63,158)
Intercompany advances, net	308,855	808,923
Net cash flows provided by financing activities	354,640	760,402
Net (decrease) increase in cash and cash equivalents	2	(27,783)
Cash and cash equivalents at beginning of period		79,363
Cash and cash equivalents at end of period	2	51,580
Reportable legal entities | Non-Guarantor Subsidiaries
Condensed Consolidating Statements of Cash Flows
Net cash (used in) provided by operating activities	351,362	187,138
Cash flows from investing activities:
Restricted cash	10,000
Capital expenditures	(699,473)	(1,157,346)
Intercompany advances, net	(12,426)
Investment in unconsolidated affiliates	(100,823)	(67,514)
Proceeds from disposal of property, plant and equipment	2,338	17,398
Proceeds from sale of equity interest in unconsolidated affiliate		324,657
Net cash flows used in investing activities	(800,384)	(882,805)
Cash flows from financing activities:
Payments related to intercompany financing, net	(1,164)	(1,034)
Proceeds from sale of equity interest in consolidated subsidiary	11,319
Contributions from non-controlling interest	26,689
Contributions from Parent and affiliates	674,134	1,090,000
Payment of distributions	(325,683)	(151,200)
Net cash flows provided by financing activities	385,295	937,766
Net (decrease) increase in cash and cash equivalents	(63,727)	242,099
Cash and cash equivalents at beginning of period	108,887	5,718
Cash and cash equivalents at end of period	45,160	247,817
Eliminations
Condensed Consolidating Statements of Cash Flows
Net cash (used in) provided by operating activities	10,724	3,624
Cash flows from investing activities:
Capital expenditures	(10,955)	(4,658)
Equity investments in consolidated affiliates	710,674	1,120,038
Intercompany advances, net	308,028	808,923
Distributions from consolidated affiliates	(335,866)	(214,268)
Investment in intercompany notes receivable, net	45,300	(14,200)
Net cash flows used in investing activities	717,181	1,695,835
Cash flows from financing activities:
Payments related to intercompany financing, net	(44,136)	15,234
Contributions from Parent and affiliates	(710,674)	(1,120,038)
Payment of distributions	335,760	214,268
Intercompany advances, net	(308,855)	(808,923)
Net cash flows provided by financing activities	$ (727,905)	$ (1,699,459)