Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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Amount of interest capitalized, including amount of allowance for funds used during construction.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Property and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Plant and equipment
Property and equipment, net	$ 2,650,322		$ 2,650,322		$ 2,756,669
Decrease in property and equipment			106,300
Depreciation expense	53,600	$ 62,100	163,900	$ 190,800
Interest capitalized in connection with major construction projects	0		0	200
Non-leased assets
Plant and equipment
Property and equipment	2,284,696		2,284,696		2,256,017
Less Accumulated depreciation	(1,409,108)		(1,409,108)		(1,345,147)
Property and equipment, net	875,588		875,588		910,870
Land and improvements - non-leased
Plant and equipment
Property and equipment	294,714		294,714		294,695
Building and improvements - non-leased
Plant and equipment
Property and equipment	432,980		432,980		429,015
Furniture, Fixtures and Equipment
Plant and equipment
Property and equipment	1,391,285		1,391,285		1,385,889
Leasehold Improvements
Plant and equipment
Property and equipment	134,900		134,900		130,801
Construction in progress
Plant and equipment
Property and equipment	30,817		30,817		15,617
Master lease assets \| Master Lease Agreement
Plant and equipment
Property and equipment	2,680,027		2,680,027		2,683,277
Less Accumulated depreciation	(905,293)		(905,293)		(837,478)
Property and equipment, net	1,774,734		1,774,734		1,845,799
Depreciation expense	22,700	$ 23,400	68,900	$ 69,100
Land and improvements - master lease \| Master Lease Agreement
Plant and equipment
Property and equipment	421,450		421,450		424,700
Buildings and improvements - master lease \| Master Lease Agreement
Plant and equipment
Property and equipment	$ 2,258,577		$ 2,258,577		$ 2,258,577