Fair Value Fair Value (Narrative) (Details) $ in Thousands |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
|
Jun. 30, 2019
USD ($)
bbl
|
Mar. 31, 2019
USD ($)
|
Jun. 30, 2018
USD ($)
|
Jun. 30, 2019
USD ($)
bbl
|
Jun. 30, 2018
USD ($)
|
|
| Derivative [Line Items] | |||||
| Gain (Loss) on Disposition of Other Assets | $ 4,646 | $ 0 | $ 26,434 | $ 0 | |
| Energy Related Derivative [Member] | |||||
| Derivative [Line Items] | |||||
| Derivative, Nonmonetary Notional Amount | bbl | 30,000 | 30,000 | |||
| BridgeTex [Member] | |||||
| Derivative [Line Items] | |||||
| Gain (Loss) on Disposition of Other Assets | $ 11,000 | ||||
| BridgeTex [Member] | Indemnification Agreement [Member] | |||||
| Derivative [Line Items] | |||||
| Guarantees, Fair Value Disclosure | $ 5,000 | ||||