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Financial Instruments - Derivatives and Hedging (Cash Flow Hedging Relationship) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]        
Change in unrealized gain (loss) on interest rate swaps $ (325) $ (3,180) $ 2,274 $ (27,011)
Amortization of interest rate swaps to interest expense 3,157 2,345 6,224 2,298
Change in unrealized gain (loss) on interest rate swaps, net $ 2,832 $ (835) $ 8,498 $ (24,713)