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Investment in Unconsolidated Entities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Equity and cost method investments      
Capital contributions, loans, advances and adjustments $ 123,250 $ 127,939  
Cumulative share of income 1,468,312 1,323,898  
Cumulative share of distributions 1,205,497 1,145,438  
Equity method investments 386,065 306,399  
Cost method investments 15,655 15,330  
Total investments in unconsolidated entities 401,720 321,729 $ 301,772
Equity method investments, combined assets      
Current 670,723 733,133  
Due from affiliates 88,685 303,322  
Property and other 4,604,312 2,345,562  
Total assets 5,363,720 3,382,017  
Equity method investments, combined liabilities and equity      
Current liabilities 810,121 407,073  
Deferred credits 242,301 175,516  
Long-term liabilities 157,785 29,342  
Long-term capital lease obligations 1,539 1,722  
Partners' capital and shareholders' equity 4,151,974 2,768,364  
Total liabilities and equity 5,363,720 3,382,017  
Equity method investments, combined income statements      
Revenues 6,979,184 6,700,266 6,239,200
Operating expenses 5,245,216 5,063,925 4,492,372
Operating income 1,733,968 1,636,341 1,746,828
Other income (expense), net (9,049) 6,741 4,019
Net income $ 1,724,919 $ 1,643,082 $ 1,750,847