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Partners' Capital, Mezzanine Capital and Distributions (Redeemable Noncontrolling Interest - Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Apr. 14, 2020
Sep. 23, 2019
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Jul. 31, 2020
Dec. 31, 2019
Redeemable Noncontrolling Interest [Line Items]                
Redeemable noncontrolling interest redemption value adjustments     $ 4,149,000 $ 272,000 $ 12,394,000 $ 272,000    
Redeemable noncontrolling interest redemption value adjustments allocated to PIK distributions         10,216,000      
Redemption accretion of redeemable preferred noncontrolling interest         $ 2,178,000      
Redeemable Noncontrolling Interest Preferred Units                
Redeemable Noncontrolling Interest [Line Items]                
Number of preferred units outstanding (in units)     139,359   139,359     130,000
Subsidiary | Alkali Holdings                
Redeemable Noncontrolling Interest [Line Items]                
Issuance of redeemable noncontrolling interest   $ 55,000,000            
Facility expansion costs percentage   100.00%            
Expansion project extension period 1 year              
Equity preferred units issued (in shares) 1,750           7,609  
Period for occurrence of triggering events   6 years 6 months            
Redeemable noncontrolling interest redemption value adjustments     $ 4,200,000   $ 12,400,000      
Redeemable noncontrolling interest redemption value adjustments allocated to PIK distributions     3,500,000   10,200,000      
Redemption accretion of redeemable preferred noncontrolling interest     700,000   2,200,000      
Redemption value of redeemable preferred noncontrolling interest     $ 194,800,000   $ 194,800,000      
Subsidiary | Alkali Holdings | Redeemable Noncontrolling Interest Preferred Units                
Redeemable Noncontrolling Interest [Line Items]                
Number of preferred units outstanding (in units)   55,000            
Subsidiary | Alkali Holdings | Maximum                
Redeemable Noncontrolling Interest [Line Items]                
Redeemable noncontrolling interest preferred commitment   $ 350,000,000