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CLOSURE AND POST-CLOSURE LIABILITIES (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2016
USD ($)
Changes to post-closure liabilities  
Beginning balance $ 56,249
Liabilities assumed in acquisitions 2,408
Adjustments during the measurement period related to 2015 acquisitions 657
New asset retirement obligations 1,650
Accretion 3,744
Changes in estimates recorded to statement of operations (711)
Expenditures (1,613)
Currency translation and other 183
Ending balance $ 62,567
Credit-adjusted risk-free rate 6.23%
Landfill Retirement Liability  
Changes to post-closure liabilities  
Beginning balance $ 32,023
Liabilities assumed in acquisitions 0
Adjustments during the measurement period related to 2015 acquisitions 0
New asset retirement obligations 1,650
Accretion 1,996
Changes in estimates recorded to statement of operations (597)
Expenditures (904)
Currency translation and other 130
Ending balance 34,298
Non-Landfill Retirement Liability  
Changes to post-closure liabilities  
Beginning balance 24,226
Liabilities assumed in acquisitions 2,408
Adjustments during the measurement period related to 2015 acquisitions 657
New asset retirement obligations 0
Accretion 1,748
Changes in estimates recorded to statement of operations (114)
Expenditures (709)
Currency translation and other 53
Ending balance $ 28,269