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Partners' Capital, Mezzanine Capital and Distributions (Redeemable Noncontrolling Interest - Narrative) (Details) - USD ($)
3 Months Ended
Sep. 23, 2019
Mar. 31, 2020
Mar. 31, 2019
Redeemable Noncontrolling Interest [Line Items]      
Proceeds from redeemable noncontrolling interest   $ 122,900,000  
Redeemable noncontrolling interest redemption value adjustments   (4,086,000) $ 0
Redemption accretion of redeemable preferred noncontrolling interest   792,000  
Subsidiary | Alkali Holdings      
Redeemable Noncontrolling Interest [Line Items]      
Issuance of redeemable noncontrolling interest $ 55,000,000 130,000,000  
Facility expansion costs percentage 100.00%    
Period for occurrence of triggering events 6 years    
Redeemable noncontrolling interest redemption value adjustments   4,100,000  
Redeemable noncontrolling interest paid in-kind   3,300,000  
Redemption accretion of redeemable preferred noncontrolling interest   800,000  
Redemption value of redeemable preferred noncontrolling interest   $ 192,500,000  
Subsidiary | Alkali Holdings | Maximum      
Redeemable Noncontrolling Interest [Line Items]      
Redeemable noncontrolling interest preferred commitment $ 350,000,000