v3.10.0.1
Summary of Significant Accounting Policies Summary of Significant Accounting Policies (New Accounting Pronouncements) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2018
Item Effected [Line Items]        
Distributions from operations of non-controlled entities $ 196,686 $ 146,211 $ 87,987  
Net Cash Provided by (Used in) Operating Activities 1,352,950 1,131,229 973,304  
Distributions from returns of investments in non-controlled entities 1,786 55,931 0  
Net Cash Provided by (Used in) Investing Activities (119,256) (593,174) (866,630)  
Property, plant and equipment 7,628,592 7,235,468    
Accumulated depreciation (1,830,411) (1,682,633)    
Net property, plant and equipment 5,798,181 5,552,835    
Investments in non-controlled entities 1,076,306 1,082,511 931,255  
Deferred revenue 121,085 117,795    
Other noncurrent liabilities 82,240 30,350    
Limited partner unitholders 2,763,925 2,267,231    
Accounting Standards Update 2014-09 [Member]        
Item Effected [Line Items]        
Property, plant and equipment 7,628,592     $ 7,243,984
Accumulated depreciation (1,830,411)     (1,682,958)
Net property, plant and equipment 5,798,181     5,561,026
Investments in non-controlled entities 1,076,306     1,083,013
Deferred revenue 121,085     115,894
Other noncurrent liabilities 82,240     34,969
Limited partner unitholders 2,763,925     2,273,206
Previously Reported [Member]        
Item Effected [Line Items]        
Distributions from operations of non-controlled entities   123,660 78,723  
Net Cash Provided by (Used in) Operating Activities   1,108,678 964,040  
Distributions from returns of investments in non-controlled entities   78,482 9,264  
Net Cash Provided by (Used in) Investing Activities   (570,623) (857,366)  
Restatement Adjustment [Member] | Accounting Standards Update 2016-15 [Member]        
Item Effected [Line Items]        
Distributions from operations of non-controlled entities   22,551 9,264  
Net Cash Provided by (Used in) Operating Activities   22,551 9,264  
Distributions from returns of investments in non-controlled entities   (22,551) (9,264)  
Net Cash Provided by (Used in) Investing Activities   (22,551) $ (9,264)  
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]        
Item Effected [Line Items]        
Property, plant and equipment 7,610,591 7,235,468    
Accumulated depreciation (1,829,742) (1,682,633)    
Net property, plant and equipment 5,780,849 5,552,835    
Investments in non-controlled entities 1,075,805 1,082,511    
Deferred revenue 125,717 117,795    
Other noncurrent liabilities 72,922 30,350    
Limited partner unitholders 2,750,778 $ 2,267,231    
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]        
Item Effected [Line Items]        
Property, plant and equipment 18,001     8,516
Accumulated depreciation (669)     (325)
Net property, plant and equipment 17,332     8,191
Investments in non-controlled entities 501     502
Deferred revenue (4,632)     (1,901)
Other noncurrent liabilities 9,318     4,619
Limited partner unitholders $ 13,147     $ 5,975