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(Tables)
 12 Months Ended
Dec. 31, 2018
Real Estate [Abstract]  
Carrying Value of Real Estate Investments

The carrying value of real estate investments is as follows:

 
December 31,
 
2018
 
2017
 
(in thousands)
Land
$
4,536,013

 
$
4,143,513

Buildings, building improvements, land improvements and integral equipment
8,782,321

 
8,512,334

 
13,318,334

 
12,655,847

Less: Accumulated depreciation
(2,812,205
)
 
(2,633,909
)
 
$
10,506,129

 
$
10,021,938