Organization and Summary of Significant Accounting Policies Marketable Securities (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Schedule of Available-for-sale Securities [Line Items]
Trading Securities		$ 0
Held-to-maturity Securities, Fair Value		0
Cash and cash equivalents	104,531,000	62,313,000	191,762,000	175,635,000
Money Market Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Cash and cash equivalents	65,708,000	38,892,000
Cash and Cash Equivalents, Fair Value Disclosure	65,708,000	38,891,000
Cash and Cash Equivalents [Member] | Money Market Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	$ 65,708,000	$ 38,891,000