Property, Plant and Equipment

12 Months Ended

Dec. 31, 2015

Property, Plant and Equipment [Abstract]

6.	PROPERTY, PLANT AND EQUIPMENT

Property, plant and equipment consists of the following:


	December 31,				April 30,
	2015		2014		2014
Land	$	24,161	$	21,671	$	21,445
Landfills		536,577		513,851		496,515
Landfill operating lease contracts		125,991		120,607		115,867
Buildings and improvements		140,046		139,461		134,787
Machinery and equipment		131,384		127,359		117,193
Rolling stock		139,557		138,201		128,155
Containers		94,302		90,231		85,397

		1,192,018		1,151,381		1,099,359
Less: accumulated depreciation and amortization		789,766		736,839		695,935

	$	402,252	$	414,542	$	403,424

Depreciation expense for fiscal year 2015, transition period 2014, fiscal year 2014 and fiscal year 2013 was $33,168, $21,599, $33,094 and $34,065, respectively. Landfill amortization expense for fiscal year 2015, transition period 2014, fiscal year 2014 and fiscal year 2013 was $26,969, $17,912, $24,689 and $21,206, respectively. Depletion expense on landfill operating lease contracts for fiscal year 2015, transition period 2014, fiscal year 2014 and fiscal year 2013 was $9,428, $7,799, $9,948 and $9,372, respectively, and was recorded in cost of operations.

As of December 31, 2015, $103,904 of our property, plant and equipment served as eligible collateral under our ABL Facility.