Discontinued Operations (Details) (USD $)	3 Months Ended								12 Months Ended			3 Months Ended			12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Sep. 30, 2010 Segment, Discontinued Operations [Member]	Sep. 30, 2009 Segment, Discontinued Operations [Member]	Dec. 31, 2008 Segment, Discontinued Operations [Member]	Dec. 31, 2011 Segment, Discontinued Operations [Member]	Dec. 31, 2010 Segment, Discontinued Operations [Member]	Dec. 31, 2009 Segment, Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of businesses													$ 2,200,000
Deposit received for sale of business														500,000
Insurance recoveries, net of tax												2,800,000
OPERATING REVENUES	210,386,000	217,210,000	209,589,000	191,911,000	169,671,000	156,492,000	158,453,000	145,579,000	829,096,000	630,195,000	544,866,000				0	0	0
Income/(loss) from discontinued operations before taxes									(9,000)	2,552,000	1,149,000
Tax Benefit									0	(39,000)	(249,000)
(Loss)/income from discontinued operations, net of tax	1,000	(10,000)	0	0	(82,000)	2,745,000	(56,000)	(16,000)	(9,000)	2,591,000	1,398,000
Gain on disposal of discontinued operation																	2,200,000
Disposal costs											$ 800,000