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Income Taxes Income Taxes - Deferred Tax Asset (Liability) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Deferred tax assets:      
Net operating loss carryforwards $ 158,916 $ 116,378  
Accrued liabilities 3,133 3,486  
Other 12,124 12,479  
Deferred Tax Assets Gross 174,173 132,343  
Valuation allowances (1,027) (822)  
Total deferred tax assets 173,146 131,521  
Deferred tax liabilities:      
Property, plant and equipment (6,066) (6,440)  
Basis difference in the Partnership (103,721) (81,645)  
Other (7,150) (8,083)  
Total deferred tax liabilities (116,937) (96,168)  
Net deferred tax asset 56,209 35,353  
Deferred tax assets 56,934 36,642  
Deferred tax liabilities $ 725 $ 1,289  
U.S. statutory tax rate (as a percent) 21.00% 21.00% 21.00%