Property, Plant And Equipment

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment, Net [Abstract]

Property, Plant And Equipment

Property, Plant and Equipment

Property, plant and equipment consist of the following:

	December 31,
	2017			2016
Building and improvements	$	17,174		$	16,757
Plant and equipment	1,773,070			1,690,317
Other	83,167			72,215
	1,873,411			1,779,289
Less: Accumulated depreciation	(716,299		)	(644,070		)
	1,157,112			1,135,219
Construction in progress	39,133			87,019
Property, plant and equipment, net	$	1,196,245		$	1,222,238

Depreciation expense on property, plant and equipment of $91,154, $77,444 and $64,369 is included in cost of sales in the consolidated statements of operations for the years ended December 31, 2017, 2016 and 2015, respectively.