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Financial Instruments: Interest Rate Swaps (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total amount of Interest Expense presented in the consolidated statements of income $ 9,371 $ 9,753 $ 18,739 $ 19,239
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     18,739 19,239
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     (2,930) (678)
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     $ (15,322) $ 9,708