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Contingencies - Narratives (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Loss Contingencies [Line Items]
Long-term debt - affiliate	$ 86,478,000	$ 0
Minimum
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss	65,000,000
Maximum
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss	$ 90,000,000
Profit Units | LTIP
Loss Contingencies [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	30,000
Threshold Value	$ 855,000,000

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Threshold Value

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Portion of the carrying amount as of the balance sheet date of obligations due all related parties that is payable after one year or beyond the normal operating cycle if longer.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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