Annual report pursuant to Section 13 and 15(d)

Commitments and Contingent Liabilities - Narratives (Details)

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Commitments and Contingent Liabilities - Narratives (Details) - USD ($)
1 Months Ended 12 Months Ended
Sep. 30, 2017
Nov. 30, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2005
Loss Contingencies            
Rent expense     $ 22,704,000 $ 16,315,000 $ 6,096,000  
Purchase obligation     35,038,000      
Accrued taxes     363,000 1,919,000    
Pending Litigation | PADEP            
Loss Contingencies            
Accrual for environmental loss contingencies       1,500,000    
Value sought by counterparty   $ 1,739,000        
Settlement amount awarded to counterparty   $ 1,550,000        
Judicial Ruling | PADEP            
Loss Contingencies            
Final penalty assessment $ 215,000          
Payments for legal settlement     215      
Soil and Groundwater Contamination            
Loss Contingencies            
Accrual for environmental loss contingencies     837,000 913,000    
Subsurface Remedial and Wetlands/Marsh Management            
Loss Contingencies            
Accrual for environmental loss contingencies     1,245,000 1,776,000    
Subsurface Remediation and Soil Vapor Extraction            
Loss Contingencies            
Accrual for environmental loss contingencies     1,220,000 1,755,000    
New Jersey Locations | PCB Remediation            
Loss Contingencies            
Accrual for environmental loss contingencies     842,000 700,000   $ 500,000
Chester And Baltimore Facilities | PCB Remediation            
Loss Contingencies            
Accrual for environmental loss contingencies     $ 701,000 $ 1,048,000