Commitments and Contingencies (Details) $ in Thousands	Mar. 31, 2017 USD ($)
Large-deductible workers' compensation insurance program | Maximum
Insurance Programs
Insurance program, Company's risk per incident	$ 400
Self-insured employee health program
Insurance Programs
Insurance program, Company's risk per individual covered life	300
Professional liability
Insurance Programs
Insurance program, Company's risk per claim	0
General liability
Insurance Programs
Insurance program, Company's risk per claim	0
D&O coverage | Minimum
Insurance Programs
Insurance program, Company's risk per claim	200
D&O coverage | Maximum
Insurance Programs
Insurance program, Company's risk per claim	$ 500