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Financial Instruments: Derivatives and Hedging - Interest Rate Swaps (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Total amount of Interest Expense presented in the consolidated statements of income $ 36,757 $ 38,374 $ 32,387
Interest rate swap      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Total amount of Interest Expense presented in the consolidated statements of income 36,757 38,374 32,387
Interest rate swap | Amounts of previously recorded gain/(loss) reclassified from OCI into Interest Expense      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Total amount of Interest Expense presented in the consolidated statements of income 4,328 2,722 (1,821)
Interest rate swap | Amounts of gain (loss) recognized in OCI      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Total amount of Interest Expense presented in the consolidated statements of income $ (15,119) $ 5,321 $ 4,867