Goodwill and Other Intangible Assets (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Net (Excluding Goodwill)	$ 20,843,000	$ 25,271,000
Amortization of Intangible Assets	3,700,000	4,200,000	5,000,000
Estimated amortization expense for amortizable intangible assets
2012	3,800,000
2013	3,700,000
2014	3,300,000
2015	2,600,000
2016	2,100,000
Thereafter	5,300,000
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Other amortizable intangible assets	21,702,000	24,942,000
Accumulated amortization	(10,392,000)	(11,625,000)
Intangible Assets, Net (Excluding Goodwill)	11,310,000	13,317,000
Noncompete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Other amortizable intangible assets	7,685,000	9,405,000
Accumulated amortization	(5,371,000)	(6,425,000)
Intangible Assets, Net (Excluding Goodwill)	2,314,000	2,980,000
Other [Member}
Finite-Lived Intangible Assets [Line Items]
Other amortizable intangible assets	11,442,000	13,217,000
Accumulated amortization	(4,223,000)	(4,243,000)
Intangible Assets, Net (Excluding Goodwill)	$ 7,219,000	$ 8,974,000