Derivative Financial Instruments (Schedule Of Contracts Designated As Hedged Instruments) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
Canadian Dollars [Member]
Foreign Exchange Contracts [Line Items]
Foreign exchange contracts, Notional Amount	$ 5,871	$ 1,062
Derivative, Maturity Date	Feb. 01, 2015	Feb. 01, 2014
Norwegian Kroner [Member]
Foreign Exchange Contracts [Line Items]
Foreign exchange contracts, Notional Amount	1,878	9,253
Derivative, Maturity Date	Aug. 01, 2014	Aug. 01, 2014
British Pounds [Member]
Foreign Exchange Contracts [Line Items]
Foreign exchange contracts, Notional Amount	1,456	2,626
Derivative, Maturity Date	Feb. 01, 2015	Feb. 01, 2015
Euros [Member]
Foreign Exchange Contracts [Line Items]
Foreign exchange contracts, Notional Amount	16,797	26,806
Derivative, Maturity Date	Feb. 01, 2015	Feb. 01, 2015
Swiss Francs [Member]
Foreign Exchange Contracts [Line Items]
Foreign exchange contracts, Notional Amount	18,123	30,698
Derivative, Maturity Date	Feb. 01, 2015	Feb. 01, 2015
Japanese Yen [Member]
Foreign Exchange Contracts [Line Items]
Foreign exchange contracts, Notional Amount	$ 472,110	$ 792,696
Derivative, Maturity Date	Feb. 01, 2015	Feb. 01, 2015