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Income Taxes (Summary of Income Tax Contingencies) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Taxes [Abstract]      
Balance as of January 1 $ 3,839 $ 4,304 $ 3,888
Tax positions related to the current year:      
Additions 31 208 201
Tax positions related to prior years:      
Additions     523
Reductions (176) (61)  
Expiration of statutes of limitation (49) (612) (308)
Balance as of December 31 $ 3,645 $ 3,839 $ 4,304