Property, Plant, and Equipment

12 Months Ended

Dec. 31, 2021

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment Disclosure

Property, Plant and Equipment

Property, plant and equipment at December 31 was as follows:

	2021		2020		Weighted Average Depreciable Life in Years
	(Dollars in thousands, where applicable)
Regulated:
Electric:
Generation	$	1,056,632	$	1,133,390	48
Distribution	474,037		464,442		47
Transmission	562,080		524,155		65
Construction in progress	62,781		61,766		—
Other	140,117		139,650		14
Natural gas distribution:
Distribution	2,427,779		2,302,121		50
Transmission	107,721		104,695		60
Storage	34,997		33,014		39
General	197,653		198,211		14
Construction in progress	21,741		16,836		—
Other	225,272		213,976		14
Pipeline:
Transmission	673,344		665,567		46
Storage	57,670		52,632		53
Construction in progress	263,640		46,690		—
Other	50,477		49,640		17
Non-regulated:
Pipeline:
Construction in progress	18		4		—
Other	6,719		7,164		10
Construction materials and contracting:
Land	149,066		132,948		—
Buildings and improvements	149,262		130,417		21
Machinery, vehicles and equipment	1,414,260		1,284,604		12
Construction in progress	50,425		23,803		—
Aggregate reserves	584,683		456,704		*
Construction services:
Land	6,513		7,218		—
Buildings and improvements	39,039		41,674		24
Machinery, vehicles and equipment	166,739		163,080		7
Other	13,467		8,824		2
Other:
Land	2,648		2,648		—
Other	34,069		34,897		7
Less accumulated depreciation, depletion and amortization	3,216,461		3,133,831
Net property, plant and equipment	$	5,756,388	$	5,166,939

*Depleted on the units-of-production method based on recoverable aggregate reserves.