Accumulated Other Comprehensive Loss (Schedule Of Accumulated Other Comprehensive Loss By Component) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Accumulated other comprehensive income loss [Line Items]
Accumulated other comprehensive income (loss), net of tax, beginning balance	$ (9,475)
Other comprehensive gain (loss) before reclassifications	(3,457)
Amounts reclassified from accumulated other comprehensive loss	(4)
Other comprehensive loss	(3,461)	(44)
Accumulated other comprehensive income (loss), net of tax, ending balance	(12,936)
Foreign currency translaction adjustments [Member]
Accumulated other comprehensive income loss [Line Items]
Accumulated other comprehensive income (loss), net of tax, beginning balance	(9,688)
Other comprehensive gain (loss) before reclassifications	(3,462)
Amounts reclassified from accumulated other comprehensive loss	0
Other comprehensive loss	(3,462)
Accumulated other comprehensive income (loss), net of tax, ending balance	(13,150)
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	(64)
Other comprehensive gain (loss) before reclassifications	5
Amounts reclassified from accumulated other comprehensive loss	0
Other comprehensive loss	5
Accumulated other comprehensive income (loss), net of tax, ending balance	(59)
Other [Member]
Accumulated other comprehensive income loss [Line Items]
Accumulated other comprehensive income (loss), net of tax, beginning balance	277
Other comprehensive gain (loss) before reclassifications	0
Amounts reclassified from accumulated other comprehensive loss	(4)
Other comprehensive loss	(4)
Accumulated other comprehensive income (loss), net of tax, ending balance	$ 273