Fair Value Measurement (Financial Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Assets, Fair Value Disclosure [Abstract]
Cash equivalents	$ 35,709	$ 100,615
Marketable securities	5,339	10,709
Investments	48,987	9,948
Interest Rate Swap [Member]
Assets, Fair Value Disclosure [Abstract]
Interest rate swap contracts	60	1,444
Foreign Exchange Forward [Member]
Assets, Fair Value Disclosure [Abstract]
Foreign currency derivatives	3,188	3,801
Liabilities, Fair Value Disclosure [Abstract]
Foreign currency derivatives	3,587	4,475
Other Contract [Member]
Assets, Fair Value Disclosure [Abstract]
Other derivatives	78,586	37,065
Level I [Member]
Assets, Fair Value Disclosure [Abstract]
Cash equivalents	35,709	100,615
Marketable securities	5,339	10,709
Investments	48,987	9,948
Level II [Member] | Interest Rate Swap [Member]
Assets, Fair Value Disclosure [Abstract]
Interest rate swap contracts	60	1,444
Level II [Member] | Foreign Exchange Forward [Member]
Assets, Fair Value Disclosure [Abstract]
Foreign currency derivatives	3,188	3,801
Liabilities, Fair Value Disclosure [Abstract]
Foreign currency derivatives	3,587	4,475
Level II [Member] | Other Contract [Member]
Assets, Fair Value Disclosure [Abstract]
Other derivatives	$ 78,586	6,174
Level III [Member] | Other Contract [Member]
Assets, Fair Value Disclosure [Abstract]
Other derivatives		$ 30,891