Goodwill and Other Intangible Assets (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Other intangible assets, net
Other intangible assets, Beginning Balance			$ 22,907,000
Less: Amortization	(2,409,000)	(1,801,000)	(7,733,000)	(5,295,000)
Other intangible assets, Ending Balance	15,174,000		15,174,000
Goodwill
Goodwill, Beginning Balance			81,598,000
Goodwill, Ending Balance	81,598,000		81,598,000
Transportation [Member]
Other intangible assets, net
Other intangible assets, Beginning Balance			11,243,000
Less: Amortization			(4,233,000)
Other intangible assets, Ending Balance	7,010,000		7,010,000
Goodwill
Goodwill, Beginning Balance			59,334,000
Goodwill, Ending Balance	59,334,000		59,334,000
Federal [Member]
Other intangible assets, net
Other intangible assets, Beginning Balance			11,664,000
Less: Amortization			(3,500,000)
Other intangible assets, Ending Balance	8,164,000		8,164,000
Goodwill
Goodwill, Beginning Balance			22,264,000
Goodwill, Ending Balance	$ 22,264,000		$ 22,264,000