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Earnings Per Share (Details Textual) (USD $)	3 Months Ended		9 Months Ended
Earnings Per Share (Details Textual) (USD $)	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	218,075	711,330	218,075	711,330
Weighted Average Price of Antidilutive Securities Excluded from Computation of Earnings Per Share (in dollars per share)	$ 27.50	$ 25.68	$ 27.50	$ 25.68

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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