Leases - Components of Lease Expense, Weighted-Average Remaining Lease Term and Discount Rate and Other Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Lease cost:
Operating lease cost	$ 1,598	$ 1,574	$ 4,821	$ 4,477
Short-term lease cost	472	793	1,371	2,678
Sublease income	(40)	(39)	(119)	(91)
Total lease cost	$ 2,030	$ 2,328	6,073	7,064
Operating cash flows for operating leases			4,855	4,539
Right-of-use lease assets obtained in exchange for lease obligations, Operating leases			$ 12,823	3,339
Gain on sale and leaseback transactions, net				$ 207
Weighted Average Remaining Lease Term, Operating leases	6 years 10 months 24 days	4 years 7 months 6 days	6 years 10 months 24 days	4 years 7 months 6 days
Weighted Average Discount Rate, Operating leases	4.49%	5.45%	4.49%	5.45%