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Equity (Schedule of Accumulated other comprehensive loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance as of January 1 $ (7,023) $ (13,479) $ (10,774)
Other comprehensive income loss before reclassifications (4,505) 7,149 (2,265)
Amounts reclassified from accumulated other comprehensive income loss 3,775 (693) (440)
Other comprehensive income (loss) (730) 6,456 (2,705)
Balance as of December 31 (7,753) (7,023) (13,479)
Net unrealized gain (loss) on cash flow hedges [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance as of January 1 330 (24) (107)
Other comprehensive income loss before reclassifications (1,814) 1,315 523
Amounts reclassified from accumulated other comprehensive income loss 857 (961) (440)
Other comprehensive income (loss) (957) 354 83
Balance as of December 31 (627) 330 (24)
Foreign currency translation adjustment [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance as of January 1 (7,353) (13,455) (10,667)
Other comprehensive income loss before reclassifications (2,691) 5,834 (2,788)
Amounts reclassified from accumulated other comprehensive income loss 2,918 268
Other comprehensive income (loss) 227 6,102 (2,788)
Balance as of December 31 $ (7,126) $ (7,353) $ (13,455)