Leases - Maturities Of Operating Lease Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
2020	$ 66,820
2021	60,452
2022	57,363
2023	39,202
2024	6,819
Thereafter	6,251
Total lease payments	236,907
Less: imputed interest	(31,295)
Total operating lease liabilities	205,612
Current operating lease liabilities	53,785	$ 0
Non-current operating lease liabilities	151,827	$ 0
Vessels
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
2020	60,210
2021	54,564
2022	52,106
2023	34,580
2024	2,470
Thereafter	0
Total lease payments	203,930
Less: imputed interest	(24,846)
Total operating lease liabilities	179,084
Current operating lease liabilities	48,716
Non-current operating lease liabilities	130,368
Facilities and Equipment
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
2020	6,610
2021	5,888
2022	5,257
2023	4,622
2024	4,349
Thereafter	6,251
Total lease payments	32,977
Less: imputed interest	(6,449)
Total operating lease liabilities	26,528
Current operating lease liabilities	5,069
Non-current operating lease liabilities	$ 21,459