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Fair Value Measurements Narrative (Details) (USD $)	Jun. 30, 2013
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Note receivable	$ 25,000,000
Available-for-sale securities, continuous unrealized loss position, twelve months or longer	0
Probability of note receivable conversion	90.00%
Alternative probability of conversion [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Note receivable	$ 21,100,000
Probability of note receivable conversion	70.00%

This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer.

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