Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Equity (Schedule of Accumulated other comprehensive income (loss) (Details)

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Equity (Schedule of Accumulated other comprehensive income (loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance as of January 1 $ (10,774) $ (3,647) $ 1,908
Other comprehensive income loss before reclassifications (2,265) (8,551) (6,548)
Amounts reclassified from accumulated other comprehensive income loss (440) 1,424 993
Other comprehensive income (loss) (2,705) (7,127) (5,555)
Balance as of December 31 (13,479) (10,774) (3,647)
Net unrealized gain (loss) on cash flow hedges [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance as of January 1 (107) (1,243) 153
Other comprehensive income loss before reclassifications 523 (288) (2,222)
Amounts reclassified from accumulated other comprehensive income loss (440) 1,424 826
Other comprehensive income (loss) 83 1,136 (1,396)
Balance as of December 31 (24) (107) (1,243)
Foreign currency translation adjustment [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance as of January 1 (10,667) (2,404) 1,922
Other comprehensive income loss before reclassifications (2,788) (8,263) (4,326)
Amounts reclassified from accumulated other comprehensive income loss
Other comprehensive income (loss) (2,788) (8,263) (4,326)
Balance as of December 31 $ (13,455) (10,667) (2,404)
Accumulated Other-than-Temporary Impairment Attributable to Parent [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance as of January 1   (167)
Other comprehensive income loss before reclassifications    
Amounts reclassified from accumulated other comprehensive income loss     167
Other comprehensive income (loss)     167
Balance as of December 31