Leases Operating and Finance Lease Liability (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Operating Leases
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	$ 5,732,000
Lessee, Operating Lease, Liability, Payments, Due Year Two	5,821,000
Lessee, Operating Lease, Liability, Payments, Due Year Three	4,057,000
Lessee, Operating Lease, Liability, Payments, Due Year Four	2,546,000
Lessee, Operating Lease, Liability, Payments, Due Year Five	1,658,000
Lessee, Operating Lease, Liability, Payments, Due after Year Five	2,562,000
Lessee, Operating Lease, Liability, Payments, Due	22,376,000
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	(3,606,000)
Operating Lease, Liability	18,770,000
Operating Lease, Liability, Current	6,046,000	$ 0
Operating Lease, Liability, Noncurrent	12,724,000	$ 0
Capital Leases
Finance Lease, Liability, Payments, Remainder of Fiscal Year	77,000
Finance Lease, Liability, Payments, Due Year Two	96,000
Finance Lease, Liability, Payments, Due Year Three	92,000
Finance Lease, Liability, Payments, Due Year Four	67,000
Finance Lease, Liability, Payments, Due Year Five	15,000
Finance Lease, Liability, Payments, Due after Year Five	0
Finance Lease, Liability, Payments, Due	347,000
Finance Lease, Liability, Undiscounted Excess Amount	(60,000)
Finance Lease, Liability	287,000
Finance Lease, Liability, Current	78,000
Finance Lease, Liability, Noncurrent	210,000
Operating And Finance Lease Liabilities, Payments Due [Abstract]
Lessee, Lease, Liability, Payments, Remainder of Fiscal Year	5,809,000
Lessee, Lease, Liability, Payments, Due Year Two	5,917,000
Lessee, Lease, Liability, Payments, Due Year Three	4,149,000
Lessee, Lease, Liability, Payments, Due Year Four	2,613,000
Lessee, Lease, Liability, Payments, Due Year Five	1,673,000
Lessee, Lease, Liability, Payments, Due after Year Five	2,562,000
Lease Liability, Payments, Due	22,723,000
Lease Liability, Undiscounted Excess Amount	(3,666,000)
Lease Liability	19,057,000
Lease Liability, Current	6,124,000
Lease Liability, Noncurrent	$ 12,934,000