Property and Equipment, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property and equipment	$ 1,209,141	$ 1,181,583
Less: accumulated depreciation and depletion	801,723	774,933
Property and equipment, net	407,418	406,650
Depreciation and Depletion	63,800	61,000	$ 61,000
Equipment and vehicles [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	778,549	756,602
Quarry property [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	182,267	174,839
Land and land improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	108,830	110,999
Building and leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	82,601	82,762
Office furniture and equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	$ 56,894	$ 56,381