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Summary of Significant Accounting Policies (Comprehensive Income (Loss) Narrative) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Summary Of Significant Accounting Policies Comprehensive Income Loss Narrative Details
Accumulated net unrealized gains (losses) on marketable investment securities	$ 74,000	$ (15,000)
Accumulated foreign currency translation (losses) gains	$ (2,200,000)	$ 71,000

Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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