Variable Interest Entities (Details 4) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash flows from operating activities:
Net income	$ (3,895)	$ (20,027)	$ 85,498	$ (21,131)	$ 29,923	$ (15,265)	$ 186,533	$ 15,774	$ 40,445	$ 216,965	$ 104,800
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation									299,884	183,250	143,704
Accretion of asset retirement obligations									824	672	1,185
Equity in (earnings) loss of unconsolidated affiliates									(1,422)	(2,328)	(158)
Distributions from unconsolidated affiliates									6,370	8,416	4,382
Receivables									(85,927)	31,993	(45,107)
Other current assets									(9,197)	(23,285)	(3,557)
Accounts payable and accrued liabilities									68,070	28,417	54,795
Other long-term assets									(21,747)	(647)	(308)
Net cash provided by operating activities									435,650	492,013	410,403
Cash flows from investing activities:
Capital expenditures									(3,046,956)	(1,950,324)	(550,839)
Investment in unconsolidated affiliates									(17,521)	(6,066)
Net cash flows used in investing activities									(3,062,562)	(2,472,088)	(776,111)
Cash flows from financing activities:
Contributions from non-controlling interest									685,219	264,781	126,392
Payment of distributions to non-controlling interest									(211)	(71)	(62,805)
Net cash flows provided by financing activities									2,366,461	2,211,499	415,503
Net increase in cash and cash equivalents									(260,451)	231,424	49,795
Cash and cash equivalents at beginning of year				345,756				114,332	345,756	114,332	64,537
Cash and cash equivalents at end of year	85,305				345,756				85,305	345,756	114,332
As previously reported
Cash flows from operating activities:
Net income										218,788	106,245
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation										189,549	149,954
Accretion of asset retirement obligations										677	1,190
Equity in (earnings) loss of unconsolidated affiliates										(699)	1,095
Distributions from unconsolidated affiliates										2,600	300
Receivables										32,588	(45,463)
Other current assets										(23,115)	(3,728)
Accounts payable and accrued liabilities										28,412	54,745
Other long-term assets										(647)	(307)
Net cash provided by operating activities										496,713	414,698
Cash flows from investing activities:
Capital expenditures										(1,951,427)	(551,281)
Investment in unconsolidated affiliates										(5,227)
Net cash flows used in investing activities										(2,472,352)	(776,553)
Cash flows from financing activities:
Contributions from non-controlling interest										265,620	126,392
Payment of distributions to non-controlling interest										(5,887)	(66,887)
Net cash flows provided by financing activities										2,206,522	411,421
Net increase in cash and cash equivalents										230,883	49,566
Cash and cash equivalents at beginning of year								117,016		117,016	67,450
Cash and cash equivalents at end of year					$ 347,899					$ 347,899	$ 117,016