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

Consolidated Statements of Comprehensive Income (Parenthetical)

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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of Comprehensive Income [Abstract]      
Net changes in fair value of cash flow hedges, tax $ (2,131) $ (856) $ (47)
Actuarial gain (loss) on pension obligations, tax $ (257) $ 200 $ (4)