Marketable Securities - Restricted (Restricted Securities) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Amortized Cost	$ 17,504	$ 27,230
Gross Unrealized Gains	116	11
Gross Unrealized Losses	(229)	0
Fair Value		14,500
Short-Term Investments	0	14,500
Corporate Bonds
Amortized Cost		3,503
Gross Unrealized Gains		1
Gross Unrealized Losses		0
Fair Value		3,504
Short-Term Investments		3,504
Long Term Investments		0
Mutual Funds
Amortized Cost		11,049
Gross Unrealized Gains		0
Gross Unrealized Losses		(53)
Fair Value		10,996
Short-Term Investments		10,996
Long Term Investments		0
Totals
Amortized Cost		14,552
Gross Unrealized Gains		1
Gross Unrealized Losses		(53)
Fair Value		14,500
Short-Term Investments		14,500
Long Term Investments		$ 0