Fair Value Fair Value of Assets and Liabilities Measured on Nonrecurring Basis (Details)	Sep. 30, 2018 USD ($) ft²
Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average amount per square foot of land	0.50
Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average amount per square foot of land	5.00
Level 3 | Land
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Area of land | ft²	4,002,908
Level 3 | Land and land improvements | Land
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Property, plant, and equipment, fair value disclosure	$ 11,600,000
Measurement Input, Quoted Price | Level 3 | Land | Weighted Average
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average amount per square foot of land	2.90