Investments - Schedule Of Amortized Costs And Fair Value (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Cost Basis	$ 27,043	[1]	$ 9,070	[1]
Fair Value	26,912		9,055
Available-for-sale Securities, Change in Net Unrealized Holding Gain (Loss) before Taxes	(131)		(15)
Short-Term Bond Mutual Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost Basis	19,092	[1]	8,000	[1]
Fair Value	18,961		7,985
Available-for-sale Securities, Change in Net Unrealized Holding Gain (Loss) before Taxes	(131)		(15)
Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost Basis	1,101	[1]	1,070	[1]
Fair Value	1,101		1,070
Net unrealized gain (loss) in AOCI	0		0
Other Investment [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost Basis	6,850	[1]	0	[1]
Fair Value	6,850		0
Net unrealized gain (loss) in AOCI	$ 0		$ 0

[1] The cost basis represents the actual amount paid less any permanent impairment of that asset.