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Income Taxes (Summary of Income Tax Contingencies) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Taxes [Abstract]      
Balance as of January 1 $ 4,304 $ 3,888 $ 3,624
Tax positions related to the current year:      
Additions 208 201 217
Tax positions related to prior years:      
Additions   523 168
Reductions (61)    
Expiration of statutes of limitation (612) (308) (121)
Balance as of December 31 $ 3,839 $ 4,304 $ 3,888