Leases - Future Payments Against Lease Liabilities Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Finance leases
Reminder of fiscal year	$ 248
Next fiscal Year or Year 1	990	$ 925
Second fiscal year or year 2	988	925
Third fiscal year or year 3	983	925
Fourth fiscal year or year 4	949	925
Fifth fiscal year or year 5		925
After four years	3,000
After five years		2,999
Total undiscounted lease payments	7,158	7,624
Less imputed interest	(1,048)	(1,242)
Total lease liabilities	6,110	6,382
Operating leases
Reminder of fiscal year	563
Next fiscal Year or Year 1	2,573	2,237
Second fiscal year or year 2	2,558	2,730
Third fiscal year or year 3	2,514	2,538
Fourth fiscal year or year 4	2,428	2,485
Fifth fiscal year or year 5		2,373
After four years	53,545
After five years		46,853
Total undiscounted lease payments	64,181	59,216
Less imputed interest	(33,969)	(28,965)
Total lease liabilities	30,212	30,251
Total
Reminder of fiscal year	811
Next fiscal Year or Year 1	3,563	3,162
Second fiscal year or year 2	3,546	3,655
Third fiscal year or year 3	3,497	3,463
Fourth fiscal year or year 4	3,377	3,410
Fifth fiscal year or year 5		3,298
After four years	56,545
After five years		49,852
Total undiscounted lease payments	71,339	66,840
Less imputed interest	(35,017)	(30,207)
Total lease liabilities	$ 36,322	$ 36,633