Discontinued Operations - Carrying Amounts of the Major Classes of Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
ASSETS
Current assets held for sale	$ 1,117,528	$ 1,133,294
LIABILITIES
Current liabilities held for sale	443,089	452,202
Discontinued Operations, Held-for-sale
ASSETS
Inventory	3,651	5,746
Prepaid expenses and other	42,942	47,003
Property, plant and equipment, net	299,246	299,647
Intangible assets, net	166,103	176,459
Goodwill	146,383	146,383
Operating lease right-of-use assets	420,410	421,586
Deferred charges and other assets	38,793	36,470
Current assets held for sale	1,117,528	1,133,294
LIABILITIES
Current operating lease liabilities	398,340	409,887
Accrued liabilities and other	10,775	8,770
Asset retirement obligations	33,974	33,545
Current liabilities held for sale	$ 443,089	$ 452,202