Share Based Compensation (Details 3) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended
Sep. 30, 2012
Activity in the Company's LTIP
Outstanding, Number of Share, January 1, 2012	49,907
Outstanding, Weighted Average Exercise Price, Beginning Balance	$ 34.39
Granted, Number of Shares	0
Granted, Weighted Average Exercise Price	$ 0.00
Exercised, Number of Shares	(9,111)
Exercised, Weighted Average Exercise Price	$ 19.26
Forfeited, Number of Shares	0
Forfeited, Weighted Average Exercise Price	$ 0.00
Outstanding (vested and expected to vest) at September 30, 2012	40,796
Weighted Average Exercise Price per Share, Outstanding	$ 37.77
Outstanding, Weighted Average Remaining Contractual Term	4 years 3 months 18 days
Outstanding, Aggregate Intrinsic Value,	$ 675
Exercisable, Number of Shares	38,671
Exercisable, Weighted Average Exercise Price	$ 37.69
Exercisable, Weighted Average Remaining Contractual Term	4 years 1 month 6 days
Exercisable, Intrinsic Value	643
Long Term Incentive Plan [Member]
Activity in the Company's LTIP
Outstanding, Number of Share, January 1, 2012	27,000
Outstanding, Weighted Average Exercise Price, Beginning Balance	$ 48.21
Granted, Number of Shares	8,000
Granted, Weighted Average Exercise Price	$ 57.28
Exercised, Number of Shares	(1,250)
Exercised, Weighted Average Exercise Price	$ 52.10
Forfeited, Number of Shares	0
Forfeited, Weighted Average Exercise Price	$ 0.00
Outstanding (vested and expected to vest) at September 30, 2012	33,750
Weighted Average Exercise Price per Share, Outstanding	$ 50.21
Outstanding, Weighted Average Remaining Contractual Term	8 years 9 months 18 days
Outstanding, Aggregate Intrinsic Value,	162
Exercisable, Number of Shares	6,250
Exercisable, Weighted Average Exercise Price	$ 40.89
Exercisable, Weighted Average Remaining Contractual Term	7 years 7 months 6 days
Exercisable, Intrinsic Value	$ 84

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