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Stockholders' Deficit Stockholders' (Deficit) Equity (Changes In Components Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Stockholders' Equity Note [Abstract]      
Foreign Currency Translation Adjustmentss Loss, Changes $ 530 $ 85  
Foreign Currency Translation Adjustment, Balance (2,836) (3,366) $ (3,451)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax (18) 455  
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax (105) (87) (542)
Other Comprehensive Income (Loss), Net of Tax 512 540 (995)
Accumulated Other Comprehensive Income (Loss), Net of Tax $ (2,941) $ (3,453) $ (3,993)