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Share Repurchase Program	6 Months Ended
Share Repurchase Program	Jun. 30, 2012
Equity [Abstract]
Share Repurchase Program	Share Repurchase Program Under the authorization of the Company’s Board of Directors, the Company maintains an ongoing share repurchase program. On August 4, 2011, the Board of Directors authorized a $250.0 million increase to the share repurchase program, bringing the total authorization to $650.0 million. The $650.0 million authorization is for repurchases made from and after August 5, 2009. No repurchases were made by the Company pursuant to this share repurchase program during the six months ended June 30, 2012. As of June 30, 2012, the Company had remaining authorization to purchase up to an additional $298.6 million of shares of its common stock under the share repurchase program, subject to certain limitations under the Company's 7.5% Senior Notes and the Merger Agreement (discussed in Note 12).