Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2018

Property, Plant and Equipment [Abstract]

Schedule of Property, Plant and Equipment

	(in thousands)
December 31,	2018			2017
Land and improvements	$	654,786		$	639,878
Buildings and improvements		1,283,182			1,249,350
Machinery and equipment		11,101,840			10,937,416
Proved oil and gas properties		557,383			556,507
Leasehold interest in unproved oil and gas properties		165,000			165,000
Construction in process and equipment deposits		762,884			241,820
		14,525,075			13,789,971
Less accumulated depreciation		(9,190,327	)		(8,696,824	)
	$	5,334,748		$	5,093,147