Lease Operations (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Lease Operations
Revenue from lease arrangements	$ 122,900,000	$ 84,000,000	$ 67,400,000
Contingent lease payments received	16,900,000	15,200,000
Minimum future rentals on the non-cancellable operating leases
2014	111,739,000
2015	110,025,000
2016	110,445,000
2017	110,445,000
2018	110,445,000
2019 and thereafter	504,779,000
Total minimum future rentals	1,057,878,000
Investment in assets held for operating lease by major classes
Property, plant and equipment	1,248,454,000	1,064,439,000
Less: accumulated depreciation	(130,041,000)	(78,343,000)
Total property, plant and equipment, net	1,118,413,000	986,096,000
Natural gas gathering and NGL transportation pipelines and facilities
Investment in assets held for operating lease by major classes
Property, plant and equipment	755,136,000	737,500,000
Natural gas processing facilities
Investment in assets held for operating lease by major classes
Property, plant and equipment	374,312,000	123,076,000
Construction in progress
Investment in assets held for operating lease by major classes
Property, plant and equipment	$ 119,006,000	$ 203,863,000