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Organization and Summary of Significant Accounting Policies Risks - concentration Revenue and Acct Rec, trading and H-T-M amounts (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Cash and cash equivalents	$ 107,558	$ 104,531	$ 69,817	$ 62,313
Money Market Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Cash and cash equivalents	54,652	65,708
Cash and Cash Equivalents, Fair Value Disclosure	$ 54,652	$ 65,708

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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