Commitments and Contingencies (Details) (USD $)	Jun. 30, 2012	Dec. 31, 2011
Commitments and Contingencies (Additional Textual) [Abstract]
Insurance reserves	$ 7,300,000	$ 7,200,000
Insurance reserves classified as current accrued liabilities and other	964,000	951,000
Marketing contract expense, 2012	1,200,000
Marketing contract expense, 2013	1,200,000
Marketing contract expense, 2014	1,200,000
Maximum [Member]
Commitments and Contingencies (Textual) [Abstract]
Estimate of the amount of probable loss	12,300,000
Minimum [Member]
Commitments and Contingencies (Textual) [Abstract]
Estimate of the amount of probable loss	$ 5,900,000