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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2012
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On January 17, 2013, we entered into an amended and restated $350.0 million senior credit agreement (the "amended and restated senior credit agreement"). The amended and restated senior credit agreement consists of a $350.0 million revolving credit facility expiring on January 17, 2018. The amended and restated senior credit agreement was used to repay borrowings outstanding on the revolving credit facility under the then existing senior credit agreement.