Fair Value Measurement (Financial Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Assets, Fair Value Disclosure [Abstract]
Cash equivalents	$ 100,615	$ 65,384
Available for sale securities	10,709
Investments	9,948
Interest Rate Swap [Member]
Assets, Fair Value Disclosure [Abstract]
Interest rate swap contracts	1,444	1,471
Liabilities, Fair Value Disclosure [Abstract]
Interest rate swap contracts		762
Foreign Exchange Forward [Member]
Assets, Fair Value Disclosure [Abstract]
Foreign currency derivatives	3,801	6,096
Liabilities, Fair Value Disclosure [Abstract]
Foreign currency derivatives	4,475	3,147
Other Contract [Member]
Assets, Fair Value Disclosure [Abstract]
Other derivatives	37,065	12,308
Level I [Member]
Assets, Fair Value Disclosure [Abstract]
Cash equivalents	100,615	65,384
Available for sale securities	10,709
Investments	9,948
Level II [Member] | Interest Rate Swap [Member]
Assets, Fair Value Disclosure [Abstract]
Interest rate swap contracts	1,444	1,471
Liabilities, Fair Value Disclosure [Abstract]
Interest rate swap contracts		762
Level II [Member] | Foreign Exchange Forward [Member]
Assets, Fair Value Disclosure [Abstract]
Foreign currency derivatives	3,801	6,096
Liabilities, Fair Value Disclosure [Abstract]
Foreign currency derivatives	4,475	3,147
Level II [Member] | Other Contract [Member]
Assets, Fair Value Disclosure [Abstract]
Other derivatives	6,174
Level III [Member] | Other Contract [Member]
Assets, Fair Value Disclosure [Abstract]
Other derivatives	$ 30,891	$ 12,308