Stock Based Incentive Plan - Status of Options Granted Under Long-term Incentive Plan (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Status of options granted under long term incentive plan
Shares Under Option, Outstanding, Beginning balance	497,499
Weighted Average Exercise Price Per Share, Outstanding, Beginning balance	$ 22.09
Shares Under Option, Granted	99,000
Weighted Average Exercise Price Per Share, Granted	$ 14.82
Shares Under Option, Expired	(8,150)
Weighted Average Exercise Price Per Share, Expired	$ 24.75
Shares Under Option, Forfeited	(4,000)
Weighted Average Exercise Price Per Share, Forfeited	$ 17.45
Shares Under Option, Exercised	0
Weighted Average Exercise Price Per Share, Exercised
Share Under Option, Outstanding, Ending balance	584,349
Weighted Average Exercise Price Per Share, Outstanding, Ending balance	$ 20.85
Shares Under Option, Exercisable at December 31, 2012	359,014
Weighted Average Exercise Price Per Share, Exercisable at December 31, 2012	$ 23.41
Weighted Average Remaining Contractual Life, Outstanding at December 31, 2012	5 years 4 months 24 days
Aggregate Intrinsic Value, Outstanding at December 31, 2012	$ 226
Weighted Average Remaining Contractual Life, Exercisable at December 31, 2012	3 years 9 months 18 days
Aggregate Intrinsic Value, Exercisable at December 31, 2012