Annual report pursuant to Section 13 and 15(d)

Accumulated Other Comprehensive Income (Components Of Accumulated Other Comprehensive Income) (Details)

v3.8.0.1
Accumulated Other Comprehensive Income (Components Of Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance as of December 31, 2016 $ (1,005)    
Other comprehensive income (loss) before reclassifications 626    
Amounts reclassified from other comprehensive income (loss) (878)    
Net current period other comprehensive income (loss) 1,504 $ 205 $ 1,202
Balance as of December 31, 2017 499 (1,005)  
Foreign Currency Translation Adjustments [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance as of December 31, 2016 (1,729)    
Other comprehensive income (loss) before reclassifications 2,836    
Amounts reclassified from other comprehensive income (loss) 202    
Net current period other comprehensive income (loss) 2,634    
Balance as of December 31, 2017 905 (1,729)  
Unrealized Gains (Losses) on Cash Flow Hedges [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance as of December 31, 2016 724    
Other comprehensive income (loss) before reclassifications (2,210)    
Amounts reclassified from other comprehensive income (loss) (1,080)    
Net current period other comprehensive income (loss) (1,130)    
Balance as of December 31, 2017 $ (406) $ 724