Commitments and Contingencies (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) property	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)
Other Commitments [Line Items]
Number of Leased Properties Owned by Related Parties | property	2
Costs and Expenses, Related Party	$ 300	$ 300
Self Insurance Reserve	1,900		$ 1,800
Estimated Insurance Recoveries	13,720		$ 14,001
Letters of Credit Outstanding, Amount	$ 4,000