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Earnings per Share (Narrative) (Details)	12 Months Ended
Earnings per Share (Narrative) (Details)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock Options And Service Based Restricted Stock Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, number of shares	409,250	721,590	1,774,372
Performance Based Restricted Stock Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, number of shares	120,363	21,858	73,012

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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