Commitments and Contingencies (Details)	9 Months Ended
	Sep. 30, 2017 USD ($) lawsuit	Dec. 31, 2016 USD ($)
Loss Contingencies [Line Items]
Estimated expenses and liabilities	$ 1,573,000	$ 2,657,000
Accrued medical claims	$ 1,424,000	1,411,000
Total number of law suits | lawsuit	2
Reversal of accrual	$ 500,000
Loss contingency accrual	0	$ 500,000
Minimum
Loss Contingencies [Line Items]
Aggregate medical claims for umbrella insurance coverage per calendar year	$ 4,500,000