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Computation of Basic and Diluted Earnings per Common Share - Additional Information (Details)	3 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2014
Earnings Per Share [Abstract]
Employee stock option awards excluded from computation of earnings per share, amount	1,539,861	1,308,177

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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