Comprehensive Income (Schedule Of Comprehensive Income) (Details) (Imported) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Comprehensive Income [Abstract]
Cumulative Translation Adjustment, Beginning Balance	$ (1,543)	$ (497)
Foreign currency translation adjustment, net of tax	2,231	(1,236)
Foreign currency translation adjustment, tax	(480)	190
Cumulative Translation Adjustment, Ending Balance	208	(1,543)	(497)
Investments, Beginning Balance	(664)	196
Investments, Current-period other comprehensive income (loss)	56	(1,017)
Investments, other comprehensive income (loss), tax	(12)	157
Investments, Ending Balance	(620)	(664)	196
Derivative instruments, Beginning Balance	(1,293)	(409)
Derivative instruments, Current-period other comprehensive income (loss)	3,247	(1,045)
Derivative instruments, other comprehensive income (loss), tax	(698)	161
Derivative instruments, Ending Balance	1,256	(1,293)	(409)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance	(3,500)	(710)
Accumulated other comprehensive income loss, before tax	5,534	(3,298)	(16,771)
Accumulated other comprehensive income, Current-period other comprehensive income (loss)	4,344	(2,790)	(14,255)
Tax provision related to items of other comprehensive income	(1,190)	508	2,516
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	$ 844	$ (3,500)	$ (710)