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Acquisitions Textual (Details)
$ / shares in Units, $ in Thousands, $ in Millions
9 Months Ended
Feb. 25, 2019
USD ($)
$ / shares
shares
Feb. 25, 2019
CAD ($)
Sep. 30, 2019
USD ($)
shares
Jun. 06, 2019
USD ($)
Jun. 06, 2019
CAD ($)
Feb. 25, 2019
CAD ($)
shares
Dec. 31, 2018
USD ($)
shares
Preferred Stock, Shares Issued | shares     350,000       350,000
Finite-Lived Intangible Assets, Remaining Amortization Period 20 years 20 years          
Goodwill $ 78,800   $ 338,856       $ 257,302
SemCAMS Midstream [Member]              
Noncontrolling Interest, Ownership Percentage by Parent     51.00%        
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners     49.00%        
Meritage ULC [Member]              
Business Acquisition, Percentage of Voting Interests Acquired 100.00%         100.00%  
Payments to Acquire Businesses, Gross $ 490,800 $ 645.6 $ 491,487        
Reimbursement of Estimated Capital Expenditures 115,800         $ 152.3  
Goodwill     $ 82,099        
SemCAMS Midstream [Member]              
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners     49.00%        
Business Acquisition, Percentage of Voting Interests Acquired     51.00%        
Business combination, contribution to joint venture by noncontrolling interest owner 597,200     $ 11,000 $ 14.7 785.6  
Contribution to joint venture, potential contingent consideration payable, noncontrolling interest $ 11,200         $ 14.7  
Noncontrolling Interest [Member] | SemCAMS Midstream [Member]              
Preferred Stock, Shares Issued | shares 300,000         300,000  
Preferred Stock, Value, Issued $ 228,100         $ 300.0  
Preferred share conversion, percentage of IPO price 92.50% 92.50%          
Transaction fee paid to noncontrolling interest $ 4,600         $ 6.0  
Accounts Receivable [Member]              
Goodwill, Purchase Accounting Adjustments     $ 300        
Property, Plant and Equipment [Member]              
Goodwill, Purchase Accounting Adjustments     3,000        
Finite-Lived Intangible Assets [Member]              
Goodwill, Purchase Accounting Adjustments     500        
Other Noncurrent Liabilities [Member]              
Goodwill, Purchase Accounting Adjustments     $ (500)        
Canada, Dollars | Noncontrolling Interest [Member] | SemCAMS Midstream [Member]              
Preferred stock per share annualized dividend | $ / shares $ 87.50            
Semcams [Member]              
Equity contributed to joint venture 100.00%         100.00%  
Proceeds from Divestiture of Businesses $ 490,800 $ 645.6          
Contribution to joint venture, potential contingent consideration 11,200 14.7          
Contribution to joint venture, contingent consideration, potential special share dividends 38,000 50.0          
Reimbursements for deposits paid 23,300 30.6          
Deposits made $ 22,400 $ 29.4