Leases (Narrative) (Details) - USD ($) $ in Thousands |
3 Months Ended | ||
|---|---|---|---|
Mar. 31, 2019 |
Mar. 31, 2018 |
Dec. 31, 2018 |
|
| Leases [Abstract] | |||
| Operating Leases, Rent Expense, Net | $ 9,000 | ||
| Operating Lease, Variable Lease Income | $ 13,700 | ||
| Property, Plant and Equipment [Line Items] | |||
| Property, Plant and Equipment, Gross | 7,808,952 | $ 7,628,592 | |
| Other Energy Equipment [Member] | Property Subject to Operating Lease [Member] | |||
| Property, Plant and Equipment [Line Items] | |||
| Property, Plant and Equipment, Gross | 229,600 | ||
| Containers [Member] | Property Subject to Operating Lease [Member] | |||
| Property, Plant and Equipment [Line Items] | |||
| Property, Plant and Equipment, Gross | 74,500 | ||
| Pipelines [Member] | Property Subject to Operating Lease [Member] | |||
| Property, Plant and Equipment [Line Items] | |||
| Property, Plant and Equipment, Gross | 44,300 | ||
| Property, Plant and Equipment, Other Types [Member] | Property Subject to Operating Lease [Member] | |||
| Property, Plant and Equipment [Line Items] | |||
| Property, Plant and Equipment, Gross | $ 27,900 | ||