Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Rental Property (Details)

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Summary of Significant Accounting Policies - Rental Property (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounting Policies [Abstract]      
Payroll and related costs capitalized $ 1,521 $ 2,345 $ 2,095
Interest costs capitalized $ 93 2,289 2,259
Buildings and improvements, estimated useful life 33 years    
Land improvements, estimated useful life 15 years    
Property, plant and equipment, estimated useful life, minimum 7 years    
Depreciation expense related to rental property $ 114,198 $ 107,845 $ 96,813
Purchase price allocated to assets, useful life, maximum 33 years