Quarterly report pursuant to Section 13 or 15(d)

Acquisitions (Details)

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Acquisitions (Details) (USD $)
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2012
Wheeler Bros Inc Acquisition [Member]
Jun. 06, 2011
Wheeler Bros Inc Acquisition [Member]
Business Acquisition [Line Items]        
Cost of acquired entity, cash paid     $ 3,000,000 $ 180,000,000
Prepaid employee compensation       1,900,000
Acquisition cost, net of retention bonuses       178,100,000
Maximum potential cash payment     40,000,000  
Earn-out obligation, less current portion 12,574,000 16,415,000 9,600,000  
Current Portion Of Earn Out Obligation Fair Value Disclosure $ 7,281,000 $ 4,153,000 $ 7,000,000