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Loss Per Share (Details)	12 Months Ended
Loss Per Share (Details)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Anti-dilutive share and option units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive shares and options units	1,072,000	691,000	771,700
Anti-dilutive 6% Notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive shares and options units	0	17,600	17,600
Anti-dilutive Series A Notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive shares and options units	0	5,226,000	4,740,000
Anti-dilutive Series B Notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive shares and options units	982,000	4,219,000	6,149,000

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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