Goodwill and Other Intangible Assets (Details) (USD $)	Jun. 30, 2012	Dec. 31, 2011
Summary of other intangible assets
Gross Carrying Value	$ 39,500,000	$ 32,000,000
Accumulated Amortization	(25,769,000)	(24,744,000)
Balance	13,731,000	7,256,000
BGS acquired customer relationships [Member]
Summary of other intangible assets
Gross Carrying Value	32,000,000	32,000,000
Accumulated Amortization	(25,705,000)	(24,744,000)
Balance	6,295,000	7,256,000
PRI acquired customer relationships [Member]
Summary of other intangible assets
Gross Carrying Value	6,200,000
Accumulated Amortization	(43,000)
Balance	6,157,000
PRI acquired non-compete agreement [Member]
Summary of other intangible assets
Gross Carrying Value	1,300,000
Accumulated Amortization	(21,000)
Balance	$ 1,279,000