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Equity (Detail Textual) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended		3 Months Ended
	Jun. 30, 2012	Jun. 30, 2012 Repurchase One [Member]	Jun. 30, 2012 Repurchase Two [Member]
Stock Repurchase Period [Line Items]
Repurchased shares		350,000	55,631
Repurchase of common stock	$ 9,829	$ 8,522	$ 1,307
Repurchased shares, average price		$ 24.35	$ 23.49

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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- Definition

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate 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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