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Net Income Per Common Share (Details 1) (USD $)	3 Months Ended
Net Income Per Common Share (Details 1) (USD $)	Mar. 31, 2014	Mar. 31, 2013
Schedule of antidilutive securities excluded from computation of earnings per share
Range of exercise prices, Maximum (usd per share)	$ 29.67	$ 30.63
Range of exercise prices, Minimum (usd per share)	$ 17.63	$ 19.14
Stock Options
Schedule of antidilutive securities excluded from computation of earnings per share
Number of shares (shares)	107,396	488,824

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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