Commitments and Contingencies (Details)	Dec. 31, 2015 USD ($)
Loss Contingencies [Line Items]
Self insurance Workers' Comp Coverage Ceiling per accident	$ 1,000,000
Self Insurance General Liability Claims Coverage Ceiling per occurence	4,000,000
Self Insurance Auto Liabiity Coverage Ceiling per accident	4,000,000
Accrual for Environmental Loss Contingencies	8,900,000
Recorded Third-Party Environmental Recoveries Receivable	300,000
Recorded Third-Party Environmental Recoveries, Current	100,000
Recorded Third-Party Environmental Recoveries, Noncurrent	200,000
Accrued Environmental Loss Contingencies, Current	1,000,000
Letter of Credit [Member]
Loss Contingencies [Line Items]
Letters of Credit Outstanding, Amount	98,400,000
Line of Credit Facility, Amount Outstanding	$ 0