Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 58,718	$ 47,612
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	(21,070)	(21,000)
Property, Plant and Equipment, Net	37,648	26,612
Depreciation Expense	7,500	6,800	$ 5,900
Increase (Decrease) in Other Noncurrent Assets	10,500
Net loss (gain) from property disposals	(1,943)	0	$ (448)
Office furnishings, leasehold improvements, computer equipment and computer software
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	38,178	37,567
Transportation and construction equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 20,540	$ 10,045