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Condensed Consolidated Financial Statements (Details) (USD $)	6 Months Ended
	Jun. 30, 2013 item	Dec. 31, 2012
Description of Business
Number of business segments	1
Investment Holdings
Total assets	$ 1,096,882,000	$ 1,097,532,000
All Non-United States countries
Investment Holdings
Total assets	$ 0

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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