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Financial Instruments: Interest Rate Swaps (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total amount of Interest Expense presented in the consolidated statements of income $ 9,036 $ 9,935 $ 27,775 $ 29,174
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     27,775 29,174
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     4,003 1,535
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     $ (17,852) $ 11,634