XML 23 R10.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Properties
 12 Months Ended
Dec. 31, 2019
Property, Plant and Equipment [Abstract]  
Real Estate Disclosure [Text Block] Properties

Properties at December 31, 2019 and 2018 are summarized as follows:
 
2019
 
2018
Land
$
232,744


$
233,301

Buildings, improvements, and equipment
4,395,463


4,342,664

Construction in process and pre-development costs
102,854


141,604

 
$
4,731,061


$
4,717,569

Accumulated depreciation and amortization
(1,514,992
)

(1,404,692
)
 
$
3,216,069


$
3,312,877



Depreciation expense for 2019, 2018, and 2017 was $173.0 million, $155.1 million, and $161.1 million, respectively.

The charge to operations in 2019, 2018, and 2017 for domestic and non-U.S. pre-development activities was $1.9 million, $3.8 million, and $5.6 million, respectively.