Long-Term Incentive Plan (Details) (USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012	Jun. 30, 2012 Stock options	Jun. 30, 2011 Stock options	Jun. 30, 2012 Restricted stock and restricted stock units	Jun. 30, 2011 Restricted stock and restricted stock units	Jun. 30, 2012 Restricted awards	Jun. 30, 2011 Restricted awards
Long-Term Incentive Plan
Number of shares authorized	1,908,332	1,908,332
Number of shares issuable	10,925	10,925
Term of stock options granted (in years)			10 years
Vesting period of options granted subsequent to 2006 (in years)					3 years
Total compensation cost	$ 66,000	$ 153,000
Total unrecognized compensation cost				4,000
Expected weighted-average period for recognition of unrecognized compensation (in years)				6 months 29 days			1 year 29 days	1 year 1 month 17 days
Shares
Balance outstanding at the beginning of the period (in shares)			500,000	614,832
Canceled (in shares)			(7,500)	(21,500)
Balance outstanding at the end of the period (in shares)			492,500	593,332
Exercisable at end of period (in shares)			492,500	589,332
Weighted Average Exercise Price
Balance outstanding at the beginning of the period (in dollars per shares)			$ 27.34	$ 25.81
Canceled (in dollars per share)			$ 25.67	$ 27.73
Balance outstanding at the end of the period (in dollars per shares)			$ 27.36	$ 25.74
Exercisable at end of period (in dollars per share)			$ 27.36	$ 25.87
Weighted Average Remaining Contractual Term (in years)
Balance outstanding at the end of the period (in years)			3 years 18 days	3 years 6 months 29 days
Exercisable at end of period (in years)			3 years 18 days	3 years 6 months 22 days
Nonvested shares of restricted shares rights
Nonvested at the beginning of the period (in shares)					426,192	464,298
Granted (in shares)					60,000	141,320
Vested (in shares)					(144,976)	(98,770)
Forfeited (in shares)					(13,296)	(61,129)
Nonvested at the end of the period (in shares)					327,920	445,719
Weighted Average Grant Date Fair Value
Nonvested at the beginning of the period (in dollars per share)					$ 4.15	$ 6.76
Granted (in dollars per share)					$ 1.25	$ 1.06
Vested (in dollars per share)					$ 7.14	$ 10.71
Forfeited (in dollars per share)					$ 3.28	$ 4.65
Nonvested at the end of the period (in dollars per share)					$ 2.33	$ 4.37
Total unrecognized compensation cost of restricted awards							$ 227,000	$ 978,000