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Derivative Instruments (Derivative Gains (Losses) in the Consolidated Statements of Income Related to Interest Rate Swap Contracts) (Details) - Designated as cash flow hedge - Interest rate swap - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Effective portion recognized in other comprehensive income (loss), pretax:      
Effective portion recognized in other comprehensive income (loss), pretax $ 15 $ (61) $ 85
Effective portion reclassified from other comprehensive income (loss) to interest expense, pretax:      
Effective portion reclassified from other comprehensive income (loss) to interest expense, pretax 0 0 (8)
Ineffective portion recognized in income:      
Ineffective portion recognized in income $ 0 $ 0 $ 0