Accumulated Other Comprehensive Loss (Schedule Of Accumulated Other Comprehensive Loss By Component) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated other comprehensive income loss [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance	$ (10,536)	$ (13,450)	$ (6,962)
Other comprehensive income (ioss) before reclassifications	1,442	2,382	(6,553)
Amounts reclassified from accumulated other comprehensive loss		532	65
Net current period other comprehensive income (loss)	1,442	2,914	(6,488)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	(9,094)	(10,536)	(13,450)
Foreign currency translaction adjustments [Member]
Accumulated other comprehensive income loss [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance	(8,681)	(9,674)	(2,771)
Other comprehensive income (ioss) before reclassifications	591	993	(6,903)
Net current period other comprehensive income (loss)	591	993	(6,903)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	(8,090)	(8,681)	(9,674)
Unrealized loss on investments, net of tax [Member]
Accumulated other comprehensive income loss [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance	(1,851)	(3,327)	(3,853)
Other comprehensive income (ioss) before reclassifications	418	1,476	526
Net current period other comprehensive income (loss)	418	1,476	526
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	(1,433)	(1,851)	(3,327)
Other [Member]
Accumulated other comprehensive income loss [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance	(4)	(449)	(338)
Other comprehensive income (ioss) before reclassifications	433	(87)	(176)
Amounts reclassified from accumulated other comprehensive loss		532	65
Net current period other comprehensive income (loss)	433	445	(111)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	$ 429	$ (4)	$ (449)