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CONSOLIDATED STATEMENTS OF CHANGES IN TOTAL EQUITY (Parenthetical) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2012
Dec. 31, 2010
Offering cost from follow-on public offer $ 15,000 $ 6,900 $ 100
Percentage Interest on Sale 1.00%