Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2017

Property Plant And Equipment [Abstract]

Property and Equipment

Property and equipment consist of the following (in thousands):

	December 31,
	2017			2016
Land	$	24,708		$	24,708
Building and improvements		36,459			36,269
Leasehold improvements		6,372			5,016
Computer equipment and software		109,336			91,302
Furniture and equipment		14,555			13,852
Transportation equipment		620,951			472,634
Construction in process		1,460			450
		813,841			644,231
Less:  Accumulated depreciation and amortization		(251,691	)		(205,637	)
Property and Equipment, net	$	562,150		$	438,594