Derivative Financial Instruments (Schedule Of Contracts Designated As Hedged Instruments) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Canadian Dollars [Member]
Foreign Exchange Contracts [Line Items]
Foreign exchange contracts, Notional Amount		$ 1,062
Derivative, Maturity Date		Feb. 01, 2014
Norwegian Kroner [Member]
Foreign Exchange Contracts [Line Items]
Foreign exchange contracts, Notional Amount	6,787	9,253
Derivative, Maturity Date	Aug. 01, 2014	Aug. 01, 2014
British Pounds [Member]
Foreign Exchange Contracts [Line Items]
Foreign exchange contracts, Notional Amount	2,221	2,626
Derivative, Maturity Date	Feb. 01, 2015	Feb. 01, 2015
Euros [Member]
Foreign Exchange Contracts [Line Items]
Foreign exchange contracts, Notional Amount	17,375	20,772
Derivative, Maturity Date	Feb. 01, 2015	Feb. 01, 2015
Swiss Francs [Member]
Foreign Exchange Contracts [Line Items]
Foreign exchange contracts, Notional Amount	25,631	30,698
Derivative, Maturity Date	Feb. 01, 2015	Feb. 01, 2015
Japanese Yen [Member]
Foreign Exchange Contracts [Line Items]
Foreign exchange contracts, Notional Amount	690,115	792,696
Derivative, Maturity Date	Feb. 01, 2015	Feb. 01, 2015
Swedish Kronor [Member]
Foreign Exchange Contracts [Line Items]
Foreign exchange contracts, Notional Amount	$ 5,688	$ 6,034
Derivative, Maturity Date	Feb. 01, 2015	Feb. 01, 2015