Property, plant and equipment

12 Months Ended

Dec. 31, 2017

Property, plant and equipment [abstract]

Property, plant and equipment:



	Buildings, plant installations and machinery			Finance leases		Other			TOTAL
Cost at January 1, 2017	$	4,549,816		$	206,260	$	272,878		$	5,028,954
Additions	98,780			7,667		5,001			111,448
Disposals and other	328			1,846		(2,386		)	(212		)
Cost at December 31, 2017	4,648,924			215,773		275,493			5,140,190
Accumulated depreciation at January 1, 2017	1,752,540			18,557		140,388			1,911,485
Disposals and other	(2,066		)	—		(673		)	(2,739		)
Depreciation	205,843			15,370		11,905			233,118
Accumulated depreciation at December 31, 2017	1,956,317			33,927		151,620			2,141,864
Net book value at December 31, 2017	$	2,692,607		$	181,846	$	123,873		$	2,998,326



	Buildings, plant installations and machinery			Finance leases			Other			TOTAL
Cost at January 1, 2016	$	4,521,835		$	121,849		$	204,483		$	4,848,167
Additions	35,644			87,800			74,303			197,747
Disposals and other	(7,663		)	(3,389		)	(5,908		)	(16,960		)
Cost at December 31, 2016	4,549,816			206,260			272,878			5,028,954
Accumulated depreciation at January 1, 2016	1,545,834			6,853			136,698			1,689,385
Disposals and other	(945		)	—			(5,908		)	(6,853		)
Depreciation	207,651			11,704			9,598			228,953
Accumulated depreciation at December 31, 2016	1,752,540			18,557			140,388			1,911,485
Net book value at December 31, 2016	$	2,797,276		$	187,703		$	132,490		$	3,117,469

Included in finance leases as at December 31, 2017 are capitalized costs related to a methanol terminal and storage tanks in Geismar, Louisiana, an oxygen production facility in Trinidad, and two ocean going vessels.