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Income Taxes (Schedule of Unrecognized Tax Benefits) (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 benefit at beginning of year $ 0 $ 814 $ 515
Reductions based on tax positions related to the prior year 0 (17) 0
Unrecognized tax benefit, reductions for tax year 2011 federal audit 0 (568) 0
Additions (reductions) based on tax positions related to the current year 0   299
Additions (reductions) based on tax positions related to the current year   (229)  
Reductions as a result of a lapse of the applicable statute of limitations 0 0 0
Unrecognized tax benefit at end of year $ 0 $ 0 $ 814