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Earnings Per Share (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Earnings Per Share [Abstract]
Basic weighted average common shares outstanding	132,999,781	130,575,165	132,655,172	130,562,923
Effect of dilutive securities - stock options and restricted stock	2,112,949	2,816,914	2,374,272	2,989,874
Diluted weighted average common shares outstanding	135,112,730	133,392,079	135,029,444	133,552,797
Common shares issuable upon the exercise of stock options
Anti-dilutive shares excluded from the calculation of diluted earnings per share
Number of anti-dilutive shares excluded from the calculation of diluted earnings per share (in shares)	2,300,000	3,400,000	2,700,000	3,400,000

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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