Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2019

Property and Equipment

Summary of property and equipment

The following is a summary of property and equipment (in thousands):

	December 31,
	2019		2018		Useful Life
Land and buildings	$	125,047	$	101,170	Buildings 30 Years
Leasehold improvements		15,399		13,438	Various*
Office equipment		12,379		9,669	3 - 5 Years
Construction equipment		443,285		439,875	3 - 7 Years
Transportation equipment		122,082		112,170	3 - 18 Years
Solar equipment		23,552		21,304	25 years
Construction in progress		33,159		35,094
		774,903		732,720
Less: accumulated depreciation and amortization		(399,015)		(356,836)
Property and equipment, net	$	375,888	$	375,884

* Leasehold improvements are depreciated over the shorter of the life of the leasehold improvement or the lease term.