Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2016

Property, Plant and Equipment [Abstract]

Schedule of Property, Plant and Equipment

	(in thousands) December 31,
	2016			2015
Land and improvements	$	602,218		$	585,057
Buildings and improvements		1,169,064			1,033,610
Machinery and equipment		10,524,030			10,229,602
Proved oil and gas properties		551,019			586,362
Leasehold interest in unproved oil and gas properties		165,000			—
Construction in process and equipment deposits		224,677			197,278
		13,236,008			12,631,909
Less accumulated depreciation		(8,157,358	)		(7,740,756	)
	$	5,078,650		$	4,891,153