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Real Estate Intangibles
 12 Months Ended
Dec. 31, 2018
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
Real Estate Intangibles Real Estate Intangibles 
     The following is a summary of our real estate intangibles, excluding those classified as held for sale, as of the dates indicated (dollars in thousands):
 
 
December 31, 2018
 
December 31, 2017
Assets:
 
 
 
 
In place lease intangibles
 
$
1,410,725

 
$
1,352,139

Above market tenant leases
 
63,935

 
58,443

Below market ground leases
 
64,513

 
58,784

Lease commissions
 
41,986

 
33,105

Gross historical cost
 
1,581,159

 
1,502,471

Accumulated amortization
 
(1,197,336
)
 
(1,125,437
)
Net book value
 
$
383,823

 
$
377,034

 
 
 
 
 
Weighted-average amortization period in years
 
16.0

 
15.1

 
 
 
 
 
Liabilities:
 
 
 
 
Below market tenant leases
 
$
81,676

 
$
60,430

Above market ground leases
 
8,540

 
8,540

Gross historical cost
 
90,216

 
68,970

Accumulated amortization
 
(44,266
)
 
(39,629
)
Net book value
 
$
45,950

 
$
29,341

 
 
 
 
 
Weighted-average amortization period in years
 
14.7

 
20.1


   
  The following is a summary of real estate intangible amortization income (expense) for the periods presented (in thousands):
 
 
Year Ended December 31,
 
 
2018
 
2017
 
2016
Rental income related to (above)/below market tenant leases, net
 
$
(1,269
)
 
$
875

 
$
919

Property operating expenses related to above/(below) market ground leases, net
 
(1,339
)
 
(1,231
)
 
(1,241
)
Depreciation and amortization related to in place lease intangibles and lease commissions
 
(122,515
)
 
(145,132
)
 
(132,141
)

     The future estimated aggregate amortization of intangible assets and liabilities is as follows for the periods presented (in thousands):
 
 
Assets
 
Liabilities
2019
 
$
97,199

 
$
7,005

2020
 
62,641

 
6,475

2021
 
29,855

 
5,838

2022
 
24,270

 
5,300

2023
 
20,304

 
3,440

Thereafter
 
149,554

 
17,892

Totals
 
$
383,823

 
$
45,950