Annual report pursuant to Section 13 and 15(d)

Consolidated Statements of Cash Flow (Parenthetical)

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Consolidated Statements of Cash Flow (Parenthetical) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Join venture impairments $ 0 $ 0 $ 400,000