Leases - Lease Costs and Other Information (Details)	3 Months Ended
	Mar. 31, 2019 USD ($)
Finance lease cost:
Amortization of leased assets	$ 640,000
Interest on lease liabilities	44,000
Operating lease cost	1,139,000
Short-term lease cost	439,000
Total lease cost	2,262,000
Other information
Cash paid for amounts included in the measurement of lease liabilities	2,258,000
Operating cash flows from finance leases	44,000
Operating cash flows from operating leases	1,579,000
Financing cash flows from finance leases	635,000
Right-of-use assets obtained in exchange for new finance lease liabilities	$ 224,000
Lease Term and Discount Rate
Weighted-average remaining lease term in months - finance leases	4 years 9 days
Weighted-average remaining lease term in months - operating leases	6 years 8 months 12 days
Weighted-average discount rate - finance leases	3.20%
Weighted-average discount rate - operating leases	10.50%
Variable lease cost	$ 0
Sublease income	$ 0