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Related Party Transactions (Details) (USD $)	12 Months Ended
Related Party Transactions (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	$ 200,000	$ 200,000	$ 200,000
Payments for repurchase of common stock	42,853,000	15,996,000	0
West Side Investment Management, Inc [Member]
Related Party Transaction [Line Items]
Stock repurchased during period, shares	1,884,597
Payments for repurchase of common stock	$ 41,008,831

The cash outflow to reacquire common stock during the period.

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- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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