Consolidated Statements of Changes in Equity (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement Of Stockholders Equity [Abstract]
Unrealized loss on marketable security, income tax effect			$ (809)
Unrealized derivative gains and losses on cash flow hedges, income tax effect	$ 928	$ 667	2,490
Minimum pension liability, income tax effect	(2,048)	(1,650)	$ (983)
Cumulative-effect adjustment due to adoption of ASU 2016-01, income tax effect		1,045
Foreign currency translation adjustments, income tax effect	$ 3,693	$ 6,824