Risk Management and Derivatives (Derivative Instrument Gain (Loss)) (Details) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2019 |
Dec. 31, 2018 |
|
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income | $ 271 | |
| Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Earnings | 32,518 | |
| Designated as Hedging Instrument | Interest Expense | Interest rate swap | ||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income | (32,518) | $ (6,745) |
| Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Earnings | (271) | 252 |
| Not Designated as Hedging Instrument | Interest Expense | Interest rate cap | ||
| Derivative Instruments, Gain (Loss) [Line Items] | ||
| Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income | $ (4) | $ (13) |