Fair Value - Fair Value Measurements on Nonrecurring (Details) - Land $ in Thousands	Sep. 30, 2018 USD ($)
Land and land improvements | Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Property, plant, and equipment, fair value disclosure	$ 19,019
Level 1 | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Property, plant, and equipment, fair value disclosure	0
Level 2 | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Property, plant, and equipment, fair value disclosure	7,419
Level 3 | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Property, plant, and equipment, fair value disclosure	11,600
Level 3 | Land and land improvements
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Property, plant, and equipment, fair value disclosure	$ 11,600