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Commitments, Contingencies and Derivatives (Derivatives Effect on Earnings) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]      
Effective portion of unrealized losses recognized within AOCI during the period, net of tax $ 837 $ (248) $ (637)
Net reclassification adjustment for effective portion of cash flow hedges included in interest expense, gross(1) $ 831 $ 1,592 $ 2,026