Leases (Details) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended
	Jan. 31, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Jan. 01, 2018
Lessee, Lease, Description [Line Items]
Arrangement interest rate	5.00%
Lease, Expense		$ 1,800,000	$ 1,400,000	$ 5,300,000	$ 3,900,000
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year		2,292,000		2,292,000
Operating Lease, Right-of-Use Asset		$ 27,043,000		$ 27,043,000
Operating Lease, Weighted Average Remaining Lease Term		7 years 1 month 6 days		7 years 1 month 6 days
Finance Lease, Weighted Average Remaining Lease Term		9 months 18 days		9 months 18 days
Operating Lease, Weighted Average Discount Rate, Percent		4.60%		4.60%
Finance Lease, Weighted Average Discount Rate, Percent		5.00%		5.00%
Finance leases - right of use asset		$ 1,591,000		$ 1,591,000
Lease, Right-of-Use Asset		28,634,000		28,634,000
Operating Lease, Liability, Current		(6,937,000)		(6,937,000)		$ 0
Finance Lease, Liability, Current		(528,000)		(528,000)
Operating Lease, Liability, Noncurrent		30,696,000		30,696,000
Finance Lease, Liability, Noncurrent		85,000		85,000
Lease, Liability		38,246,000		38,246,000
Finance Lease, Liability, Payments, Remainder of Fiscal Year		443,000		443,000
Lessee, Operating Lease, Liability, Payments, Due Year Two		8,037,000		8,037,000
Finance Lease, Liability, Payments, Due Year Two		130,000		130,000
Lessee, Operating Lease, Liability, Payments, Due Year Three		6,530,000		6,530,000
Finance Lease, Liability, Payments, Due Year Three		54,000		54,000
Lessee, Operating Lease, Liability, Payments, Due Year Four		4,657,000		4,657,000
Finance Lease, Liability, Payments, Due Year Four		0		0
Lessee, Operating Lease, Liability, Payments, Due Year Five		4,298,000		4,298,000
Finance Lease, Liability, Payments, Due Year Five		0		0
Lessee, Operating Lease, Liability, Payments, Due after Year Five		19,299,000		19,299,000
Finance Lease, Liability, Payments, Due after Year Five		0		0
Lessee, Operating Lease, Liability, Payments, Due		45,113,000		45,113,000
Finance Lease, Liability, Payments, Due		627,000		627,000
Lessee, Operating Lease, Liability, Undiscounted Excess Amount		(7,480,000)		(7,480,000)
Finance Lease, Liability, Undiscounted Excess Amount		(14,000)		(14,000)
Operating Lease, Liability		37,633,000		37,633,000
Finance Lease, Liability		613,000		613,000			$ 3,500,000
Accrued Liabilities [Member]
Lessee, Lease, Description [Line Items]
Finance Lease, Liability, Current		$ (528,000)		$ (528,000)