Derivative Financial Instruments (Summary Of Derivative Financial Instruments Notional Amounts On Outstanding Positions) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Derivative Financial Instruments Notional Amounts [Line Items]
Total notional value, net	$ 194,391	$ 319,639
Japanese Yen [Member]
Derivative Financial Instruments Notional Amounts [Line Items]
Total notional value, net	98,390	44,533
Euro [Member]
Derivative Financial Instruments Notional Amounts [Line Items]
Total notional value, net	34,219	134,755
British Pound Sterling [Member]
Derivative Financial Instruments Notional Amounts [Line Items]
Total notional value, net	21,859	17,230
South Korean Won [Member]
Derivative Financial Instruments Notional Amounts [Line Items]
Total notional value, net	7,981	14,590
Mexican Peso [Member]
Derivative Financial Instruments Notional Amounts [Line Items]
Total notional value, net	7,277	13,180
Australian Dollar [Member]
Derivative Financial Instruments Notional Amounts [Line Items]
Total notional value, net	6,459	7,913
South African Rand [Member]
Derivative Financial Instruments Notional Amounts [Line Items]
Total notional value, net	6,402	4,355
Indian Rupee [Member]
Derivative Financial Instruments Notional Amounts [Line Items]
Total notional value, net	5,036	3,356
Canadian Dollar [Member]
Derivative Financial Instruments Notional Amounts [Line Items]
Total notional value, net	1,980	3,005
New Taiwan Dollar [Member]
Derivative Financial Instruments Notional Amounts [Line Items]
Total notional value, net	1,798	3,229
Swedish Krona [Member]
Derivative Financial Instruments Notional Amounts [Line Items]
Total notional value, net	1,655	1,918
Hong Kong Dollar [Member]
Derivative Financial Instruments Notional Amounts [Line Items]
Total notional value, net	668	814
Russian Ruble [Member]
Derivative Financial Instruments Notional Amounts [Line Items]
Total notional value, net	$ 667	1,838
Singapore Dollar [Member]
Derivative Financial Instruments Notional Amounts [Line Items]
Total notional value, net		61,887
Chinese Yuan Renminbi [Member]
Derivative Financial Instruments Notional Amounts [Line Items]
Total notional value, net		5,376
Norwegian Krone [Member]
Derivative Financial Instruments Notional Amounts [Line Items]
Total notional value, net		917
New Zealand Dollar [Member]
Derivative Financial Instruments Notional Amounts [Line Items]
Total notional value, net		$ 743