Cash Equivalents, Marketable Securities and Other Investments (Details) (USD $) In Thousands, unless otherwise specified					12 Months Ended				12 Months Ended
	Dec. 31, 2013 securities	Dec. 31, 2012 securities	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2013 Corporate Debt Securities [Member]	Dec. 31, 2012 Corporate Debt Securities [Member]	Dec. 31, 2013 Money Market Funds [Member]	Dec. 31, 2012 Money Market Funds [Member]	Dec. 31, 2012 Commercial Paper [Member]	Dec. 31, 2013 US Treasury Securities [Member]	Dec. 31, 2012 US Treasury Securities [Member]	Dec. 31, 2013 Common Shares of Co Two Solution [Member]	Dec. 31, 2012 Common Shares of Co Two Solution [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost Basis	$ 19,654	$ 41,874			$ 1,002	$ 9,512	$ 16,089	$ 24,789	$ 1,499	$ 2,000	$ 5,511	$ 563	$ 563
Gross Unrealized Gains	235	63			3	10	0	0	1	0	5	232	47
Available-for-sale Securities, Gross Unrealized Losses	0	0			0	0	0	0	0	0	0	0	0
Available-for-sale Securities, Fair Value Disclosure	19,889	41,937			1,005	9,522	16,089	24,789	1,500	2,000	5,516	795	610
Average Contractual Maturities					140 days	156 days			70 days	59 days	262 days
Cash and cash equivalents	22,130	32,003	25,762	72,396
Money Market Funds, at Carrying Value	16,089	24,789
Cash	$ 6,041	$ 7,214
Number of Marketable Securities	0	0