Property, Plant and Equipment

12 Months Ended

Dec. 31, 2019

Property, Plant and Equipment [Abstract]

PROPERTY, PLANT, AND EQUIPMENT

At December 31, 2019 and 2018, property, plant and equipment consisted of the following:



	Depreciable Lives	2019		2018
Land	—	$	22,083	$	22,204
Improvements to land and buildings	10-25 years	135,666		134,783
Storage equipment	5-50 years	120,788		120,005
Marine vessels	4-25 years	182,115		191,070
Operating plant and equipment	3-50 years	343,236		352,235
Furniture, fixtures and other equipment	3-20 years	12,896		12,119
Transportation equipment	3-7 years	47,525		40,582
Construction in progress		20,419		13,437
		$	884,728	$	886,435

Depreciation expense for the years ended December 31, 2019, 2018 and 2017 was $53,856, $58,615 and $61,590, which includes amortization of fixed assets acquired under capital lease obligations of $2,686, $1,174, and $139. Gross assets under capital leases were $15,367 and $14,058 at December 31, 2019 and 2018, respectively. Accumulated amortization associated with capital leases was $3,941 and $1,266 at December 31, 2019 and 2018, respectively.

Additions to property, plant and equipment included in accounts payable at December 31, 2019 and 2018 were $3,791 and $2,166, respectively. Equipment purchased under capital lease obligations was $1,308, $10,472, and $3,551 for the years ended December 31, 2019, 2018, and 2017, respectively.