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Landfill Accounting (Reconciliation of Final Capping, Closure and Post-Closure Liability Balance) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Landfill Accounting [Abstract]    
Final capping, closure and post-closure liability at the beginning of the period $ 244,909  
Adjustments to final capping, closure and post-closure liabilities (27,876)  
Liabilities incurred 11,011  
Accretion expense associated with landfill obligations 8,757 $ 5,740
Closure payments (4,913)  
Foreign currency translation adjustment 2,025  
Final capping, closure and post-closure liability at the end of the period $ 233,913