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Earnings Per Common Share (Details) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Reconciliation of the basic and diluted EPS denominators
Basic weighted-average common shares	32,619	32,125	32,469	32,129
Dilutive effect of common stock options				2
Dilutive effect of restricted common stock	370	314	560	352
Dilutive effect of 2010 Convertible Notes	554		760
Diluted weighted-average common shares	33,543	32,439	33,789	32,483

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of stock options.

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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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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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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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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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