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Income Taxes (Reconciliation of Unrecognized Tax Benefits Schedule) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Unrecognized tax benefits, beginning balance $ 5,253 $ 6,184 $ 6,756
Increases based on tax positions related to the prior year     344
Decreases based on tax positions related to the prior year     (24)
Decreases based on tax positions related to the prior year (862)    
Lapse of statute of limitations (1,637) (1,236) (1,301)
Additions based on tax positions related to the current year 342 305 409
Unrecognized tax benefits, ending balance $ 3,096 $ 5,253 $ 6,184