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Partners' Capital, Mezzanine Equity and Distributions (Redeemable Noncontrolling Interest- Narrative) (Details)
 3 Months Ended 12 Months Ended
Sep. 23, 2019
USD ($)
d
manager
$ / shares
Dec. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Redeemable Noncontrolling Interest [Line Items]                  
Issuance of Preferred Units $ 55,000,000                
Proceeds From Redeemable Noncontrolling Interest             $ 122,900,000    
Net income attributable to redeemable noncontrolling interests   $ (1,961,000)   $ (272,000) $ 0 $ 0 (2,233,000) $ 0 $ 0
Redemption accretion     $ 455,000            
Genesis Alkali Holdings Company, LLC [Member] | Subsidiaries [Member]                  
Redeemable Noncontrolling Interest [Line Items]                  
Issuance of Preferred Units $ 55,000,000           130,000,000    
Redeemable Noncontrolling Interest, Equity, Preferred, Commitment Period 3 years                
Facility Expansion Costs, Funding Percentage 100.00%                
Redeemable Noncontrolling Interest, Equity, Preferred, Annual Percentage For Quarterly Distributions 10.00%                
Redeemable Noncontrolling Interest, Equity, Preferred, Liquidation Preference Per Unit | $ / shares $ 1,000                
Redeemable Noncontrolling Interest, Equity, Preferred, Days In Period After End Of Fiscal Quarter To Pay Cash Distributions | d 45                
Redeemable Noncontrolling Interest, Equity, Preferred, Period After Initial Closing Date To Pay Distributions Paid-in-kind 36 months                
Redeemable Noncontrolling Interest, Equity, Preferred, Minimum Cash Reserve Balance $ 5,000,000                
Redeemable Noncontrolling Interest, Equity, Preferred, Purchase Price Per Unit | $ / shares $ 1,000                
Redeemable Noncontrolling Interest, Equity, Preferred, Period For Triggering Event To Occur 6 years                
Net income attributable to redeemable noncontrolling interests             2,300,000    
Redeemable Noncontrolling Interest, Equity, Preferred, Paid in Kind Distribution allocation             1,800,000    
Redemption accretion             500,000    
Redeemable Noncontrolling Interest, Equity, Preferred, Fair Value   $ 192,500,000 $ 192,500,000       $ 192,500,000    
Minimum | Genesis Alkali Holdings Company, LLC [Member] | Subsidiaries [Member]                  
Redeemable Noncontrolling Interest [Line Items]                  
Redeemable Noncontrolling Interest, Equity, Preferred, Amount Authorized $ 250,000,000                
Number Board Of Managers | manager 5                
Number Of Board Managers Designated By The Partnership | manager 3                
Number Of Board Managers Designated By The Sponsor | manager 1                
Number Of Independent Board Managers | manager 1                
Maximum | Genesis Alkali Holdings Company, LLC [Member] | Subsidiaries [Member]                  
Redeemable Noncontrolling Interest [Line Items]                  
Redeemable Noncontrolling Interest, Equity, Preferred, Amount Authorized $ 350,000,000