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Income Taxes (Schedule of Current and Deferred Income Taxes) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current:      
Federal $ 5 $ (275) $ (948)
State 48 (1,433) (214)
Foreign 213 179 178
Total current 266 (1,529) (984)
Deferred:      
Federal 165 (28,161) 4,306
State 2,648 (3,992) 361
Foreign (14) (14) (15)
Total deferred 2,799 (32,167) 4,652
Provision (benefit) for income taxes $ 3,065 $ (33,696) [1] $ 3,668 [1]
[1] As adjusted for the adoption of ASC 606 using the full retrospective method.