Leases - Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
ROU assets:
Operating lease ROU assets	$ 47,535	$ 51,700
Finance lease ROU assets	52,171	56,793
Total ROU assets	99,706	108,493
Operating lease liabilities:
Current operating lease liabilities	11,379	10,763
Noncurrent operating lease liabilities	42,673	48,299
Total operating lease liabilities	54,052	59,062
Finance lease liabilities:
Current finance lease liabilities	5,939	5,672
Noncurrent finance lease liabilities	28,159	31,312
Total finance lease liabilities	$ 34,098	$ 36,984