Condensed Financial Information of Registrant Condensed Financial Information of Registrant (Narratives) (Details) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Condensed Financial Statements, Captions [Line Items]
Dividends from subsidiaries	$ 145,000,000	$ 270,000,000	$ 128,000,000
Capital contributions to subsidiaries	125,000	125,000	125,000
Mcc [Member]
Condensed Financial Statements, Captions [Line Items]
Credit facility amount	120,000,000
Bank loan	20,000,000
Municipal bonds, fair value	182,000,000
Total borrowing guaranteed	$ 140,000,000

- Definition

Bonds or similar securities issued by state, city, or local governments or the agencies operated by state, city, or local governments which are short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

+ References+ Details