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Treasury Stock Purchases	12 Months Ended
Treasury Stock Purchases	Dec. 31, 2011
Treasury Stock Purchases [Abstract]
Treasury Stock [Text Block]	Treasury Stock Purchases On March 5, 2009, the Board adopted a program to repurchase up to $30 million of our common stock in the open market or in private transactions at prevailing market prices during the 12-month period ended March 10, 2010. During 2009, we repurchased 0.3 million shares of our common stock under this program for $2.9 million at prices ranging from $10.34 to $11.00 per share. There were no shares of common stock repurchased under this program in 2010. During 2011 and 2010 we also repurchased 0.2 million and 0.2 million common shares, respectively, tendered by employees for the payment of applicable statutory withholding taxes on the issuance of restricted shares under the 2005 Performance Incentive Plan. These shares were repurchased in 2011 for $5.7 million at prices ranging from $23.11 to $33.53 and in 2010 for $4.9 million at prices ranging from $21.34 to $30.06 per share. As part of the purchase agreement with a private equity investment firm, we repurchased 0.1 million shares of our common stock for $2.0 million, or $20 per share in 2009.