Commitments and Contingencies (Details)	1 Months Ended	6 Months Ended
	May 31, 2017 USD ($)	Jun. 30, 2017 USD ($) lawsuit	Dec. 31, 2016 USD ($)
Loss Contingencies [Line Items]
Estimated expenses and liabilities		$ 2,187,000	$ 2,657,000
Accrued medical claims		$ 1,169,000	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