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Commitments and Contingencies (Details)
6 Months Ended
Jun. 30, 2016
USD ($)
lawsuit
individual
Dec. 31, 2015
USD ($)
Loss Contingencies [Line Items]    
Reserves for estimated uninsured losses $ 0 $ 1,300,000
Insurance Claims    
Loss Contingencies [Line Items]    
Liability and cargo insurance coverage for claims 500,000  
Cargo Claims    
Loss Contingencies [Line Items]    
Liability and cargo insurance coverage for claims 100,000  
Uninsured Risk    
Loss Contingencies [Line Items]    
Reserves for estimated uninsured losses $ 22,000,000 $ 25,900,000
Alleged Violations of Various California Labor Laws    
Loss Contingencies [Line Items]    
Number of pending lawsuits | lawsuit 6  
Alleged Violations of Illinois Wage Payment and Collection Act    
Loss Contingencies [Line Items]    
Number of pending lawsuits | lawsuit 1  
Violation Of California Labor Laws | Pending Litigation    
Loss Contingencies [Line Items]    
Number of plaintiffs | individual 12