Commitments and Contingencies (Details) - USD ($)	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Self insurance deductible for workers compensation	$ 5,000,000
Self insurance deductible for general liability claims	1,000,000.0
Self insurance deductible for automobile liability	1,000,000.0
Self insurance deductible for medical coverage	400,000
Self-insured risk accruals	$ 32,500,000	$ 35,000,000