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Fair-Value Measurements (Reconciliation of Changes in Derivatives Classified as Level 3) (Details) - Level 3
$ in Thousands
6 Months Ended
Jun. 30, 2020
USD ($)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]  
Balance as of December 31, 2019 $ (51,515)
Unrealized gain for the period included in earnings 10,706
Balance as of June 30, 2020 $ (40,809)