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Commitments and Contingencies - Rental Expense and Letters of Credit (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Sep. 30, 2014
Operating Lease Obligations
Rental expense under operating leases with initial terms exceeding one year	$ 242,000	$ 1,907,000	$ 1,691,000	$ 965,000
Self-insured health insurance coverage
Obligations related to health insurance and self-insured workers' compensation
Unused letters of credit		1,767,000
Self-insured retention on workers' compensation claims
Obligations related to health insurance and self-insured workers' compensation
Unused letters of credit		$ 233,000