Significant Accounting Policies (Cash and Cash Equivalents, Investments and Fair Value of Financial Instruments) (Details) (USD $)	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Accounting Policies [Abstract]
Checks outstanding	$ 26,000		$ 23,800,000
Losses recognized from other-than-temporary impairments	0	0
Fair value of fixed rate borrowings	429,000,000		424,000,000
Fair value of variable rate borrowings	$ 100,000,000		$ 100,000,000

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents notes payable as of the balance sheet date.

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The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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