Marketable Securities - Restricted (Unrealized losses on investments restricted from sale) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012 Mutual Funds security	Dec. 31, 2012 Totals security
Number In Loss Position	1	1	1
Less than twelve months - fair values	$ 12,460	$ 10,996	$ 10,996
Less than twelve months - unrealized losses	(229)	(54)	(54)
Twelve months or greater - fair values		0	0
Twelve months or greater - unrealized losses		0	0
Total Fair Value	12,460	10,996	10,996
Total Unrealized Losses	$ (229)	$ (54)	$ (54)