Share Based Compensation (Details 3) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended
Jun. 30, 2012	Jun. 30, 2011
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
Exercised, Number of Shares	(400)
Exercised, Weighted Average Exercise Price	$ 39.10
Forfeited, Number of Shares	0
Forfeited, Weighted Average Exercise Price	$ 0
Outstanding (vested and expected to vest) at June 30, 2012	49,507
Weighted Average Exercise Price per Share, Outstanding	$ 34.35
Outstanding, Aggregate Intrinsic Value,	$ 1,166
Exercisable, Number of Shares	47,382
Exercisable, Weighted Average Exercise Price	$ 34.14
Exercisable, Weighted Average Remaining Contractual Term	3 years 10 months 24 days
Exercisable, Intrinsic Value	1,126
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	0
Granted, Weighted Average Exercise Price	$ 57.28
Exercised, Number of Shares	(1,250)	(3,000)
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 June 30, 2012	33,750
Weighted Average Exercise Price per Share, Outstanding	$ 50.21
Outstanding, Weighted Average Remaining Contractual Term	9 years 1 month 6 days
Outstanding, Aggregate Intrinsic Value,	260
Exercisable, Number of Shares	6,250
Exercisable, Weighted Average Exercise Price	$ 40.89
Exercisable, Weighted Average Remaining Contractual Term	7 years 10 months 24 days
Exercisable, Intrinsic Value	$ 106

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