Fair Value Measurement (Financial Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Assets, Fair Value Disclosure [Abstract]
Cash equivalents	$ 65,955	$ 100,615
Marketable securities	8,457	10,709
Investments, Fair Value Disclosure	31,632	9,948
Interest Rate Swap [Member]
Assets, Fair Value Disclosure [Abstract]
Interest rate swap contracts	1,298	1,444
Foreign Exchange Forward [Member]
Assets, Fair Value Disclosure [Abstract]
Foreign currency derivatives	3,027	3,801
Liabilities, Fair Value Disclosure [Abstract]
Foreign currency derivatives	4,064	4,475
Other Contract [Member]
Assets, Fair Value Disclosure [Abstract]
Other derivatives	50,809	37,065
Level I [Member]
Assets, Fair Value Disclosure [Abstract]
Cash equivalents	65,955	100,615
Marketable securities	8,457	10,709
Investments, Fair Value Disclosure	31,632	9,948
Level II [Member] | Interest Rate Swap [Member]
Assets, Fair Value Disclosure [Abstract]
Interest rate swap contracts	1,298	1,444
Level II [Member] | Foreign Exchange Forward [Member]
Assets, Fair Value Disclosure [Abstract]
Foreign currency derivatives	3,027	3,801
Liabilities, Fair Value Disclosure [Abstract]
Foreign currency derivatives	4,064	4,475
Level II [Member] | Other Contract [Member]
Assets, Fair Value Disclosure [Abstract]
Other derivatives	9,712	6,174
Level III [Member] | Other Contract [Member]
Assets, Fair Value Disclosure [Abstract]
Other derivatives	$ 41,097	$ 30,891