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Summary of Significant Accounting Policies (Details)	3 Months Ended
Summary of Significant Accounting Policies (Details)	Mar. 31, 2015	Mar. 31, 2014
Outstanding Stock options
Weighted-average anti-dilutive shares related to:
Antidilutive securities excluded from computation of earnings per share (in shares)	6,519,000	4,178,000
Restricted stock awards
Weighted-average anti-dilutive shares related to:
Antidilutive securities excluded from computation of earnings per share (in shares)	685,000	922,000
Performance-based restricted stock awards
Weighted-average anti-dilutive shares related to:
Antidilutive securities excluded from computation of earnings per share (in shares)	668,160

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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