Financial Instruments (Fair Value Of Investments) (Details 1) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Amortized cost	$ 116,003	$ 129,285
Gross unrealized holding gains	21	45
Gross unrealized holding losses	(45)	(60)
Fair value	115,979	129,270
Corporate
Amortized cost	107,211	103,175
Gross unrealized holding gains	15	23
Gross unrealized holding losses	(45)	(60)
Fair value	107,181	103,138
Government agency
Amortized cost	8,792	26,110
Gross unrealized holding gains	6	22
Gross unrealized holding losses	0	0
Fair value	$ 8,798	$ 26,132