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Recent Accounting Developments (Narratives) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jan. 01, 2018
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle              
Adjustments related to TCJA     $ (300)        
Cumulative effect on other comprehensive income   $ 7,475   $ 419 $ 12,182 $ 1,859  
ASU 2017-12              
New Accounting Pronouncements or Change in Accounting Principle              
Cumulative effect on retained earnings             $ 383
Cumulative effect on other comprehensive income $ (400)