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Earnings Per Share Narrative (Details)				3 Months Ended
Earnings Per Share Narrative (Details)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Mar. 31, 2014 Stock Options [Member]	Mar. 31, 2013 Stock Options [Member]	Mar. 31, 2014 Performance Vested Restricted Stock Units [Member]	Mar. 31, 2013 Performance Vested Restricted Stock Units [Member]
Earnings Per Share [Line Items]
Outstanding stock options	2,254,960	1,661,952	1,800,000
Anti-dilutive stock options excluded from EPS calculation				0	0
PVRSUs excluded from EPS calculation due to performance conditions not met						241,578	198,394

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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