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Income Per Share - Additional Information (Details) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Per Share (Textual) [Abstract]
Additional dilutive shares related to share-based compensation	329	415	304
Stock options
Income Per Share (Textual) [Abstract]
Common stock shares effect would be anti-dilutive	26	47	110

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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