Financial Instruments (Fair Value Of Investments) (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Amortized cost	$ 129,285	$ 83,266
Gross unrealized holding gains	45	13
Gross unrealized holding losses	(60)	(35)
Fair value	129,270	83,244
Corporate
Amortized cost	103,175	50,822
Gross unrealized holding gains	23	3
Gross unrealized holding losses	(60)	(31)
Fair value	103,138	50,794
Government agency
Amortized cost	26,110	32,444
Gross unrealized holding gains	22	10
Gross unrealized holding losses	0	(4)
Fair value	$ 26,132	$ 32,450