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Financial Instruments: Interest Rate Swaps (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Total amount of Interest Expense presented in the consolidated statements of income $ 9,368 $ 9,486
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 9,368 9,486
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 1,475 84
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 $ (8,266) $ 6,491