Share-Based Compensation (Details 2) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Activity in Company's LTIP
Outstanding at January 1, 2013, Number of Shares	32,150
Outstanding at January 1, 2013, Weighted Average Exercise Price per Share	$ 40.93
Granted, Number of Shares	0
Granted, Weighted Average Exercise Price per Share	$ 0.00
Exercised, Number of Shares	0
Exercised, Weighted Average Exercise Price per Share	$ 0.00
Forfeited, Number of Shares	0
Forfeited, Weighted Average Exercise Price per Share	$ 0.00
Outstanding (vested and expected to vest) at March 31, 2013, Number of Shares	32,150
Outstanding (vested and expected to vest) at March 31, 2013, Weighted Average Exercise Price per Share	$ 40.93
Outstanding (vested and expected to vest), Weighted Average Remaining Contractual Term	4 years 1 month 6 days
Outstanding (vested and expected to vest), Aggregate Intrinsic Value	$ 934
Exercisable, Number of Shares	32,150
Exercisable, Weighted Average Exercise Price per Share	$ 40.93
Exercisable, Weighted Average Remaining Contractual Term	4 years 1 month 6 days
Exercisable, Aggregate Intrinsic Value	934
Long Term Incentive Plan [Member]
Activity in Company's LTIP
Outstanding at January 1, 2013, Number of Shares	33,750
Outstanding at January 1, 2013, Weighted Average Exercise Price per Share	$ 50.21
Granted, Number of Shares	0
Granted, Weighted Average Exercise Price per Share	$ 0.00
Exercised, Number of Shares	0	0
Exercised, Weighted Average Exercise Price per Share	$ 0.00
Forfeited, Number of Shares	0
Forfeited, Weighted Average Exercise Price per Share	$ 0.00
Outstanding (vested and expected to vest) at March 31, 2013, Number of Shares	33,750
Outstanding (vested and expected to vest) at March 31, 2013, Weighted Average Exercise Price per Share	$ 50.21
Outstanding (vested and expected to vest), Weighted Average Remaining Contractual Term	8 years 7 months 6 days
Outstanding (vested and expected to vest), Aggregate Intrinsic Value	667
Exercisable, Number of Shares	17,375
Exercisable, Weighted Average Exercise Price per Share	$ 46.00
Exercisable, Weighted Average Remaining Contractual Term	8 years 1 month 6 days
Exercisable, Aggregate Intrinsic Value	$ 416

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