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Earnings Per Share (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Schedule Of Weighted Average Number Of Shares Outstanding Basic To Diluted [Abstract]
Basic shares outstanding (in shares)	99,881,000	99,089,000	99,720,000	98,983,000
Effect of potential common stock [Abstract]
Common stock awards (in shares)	792,000	882,000	826,000	884,000
Senior subordinated convertible notes (in shares)	150,000	191,000	150,000	204,000
Diluted shares outstanding (in shares)	100,823,000	100,162,000	100,696,000	100,071,000
Antidilutive stock options (in shares)	749,666	579,350	770,665	587,350

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- Definition

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 convertible debt securities using the if-converted method.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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