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Earnings Per Share (Details) (Stock options, USD $)	12 Months Ended
Earnings Per Share (Details) (Stock options, USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stock options
Antidilutive securities excluded from the calculation of earnings per share
Average share price during the reporting period (in dollars per share)	$ 13.25	$ 12.11	$ 12.16
Options excluded from the calculation of earnings per share (in shares)		3,101,881	2,606,398
Weighted average share price during the reporting period (in dollars per share)		$ 12.28	$ 12.32

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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