Leases - Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
ROU assets:
Operating lease ROU assets	$ 38,927	$ 51,700
Finance lease ROU assets	49,860	56,793
Total ROU assets	88,787	108,493
Operating lease liabilities:
Current operating lease liabilities	11,449	10,763
Noncurrent operating lease liabilities	40,222	48,299
Total operating lease liabilities	51,671	59,062
Finance lease liabilities:
Current finance lease liabilities	6,081	5,672
Noncurrent finance lease liabilities	26,617	31,312
Total finance lease liabilities	$ 32,698	$ 36,984