Intangible Lease Liabilities, Net (Tables)
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Intangible Lease Liabilities, Net [Abstract]    
Schedule of Intangible Lease Liabilities, Net
Intangible lease liabilities, net, consisted of the following as of March 31, 2019 and December 31, 2018 (amounts in thousands, except weighted average life amounts):
 
March 31, 2019
 
December 31, 2018
Below-market leases, net of accumulated amortization of $8,824 and $7,592, respectively (with a weighted average remaining life of 17.4 years and 17.6 years, respectively)
$
56,374

 
$
57,606

Intangible lease liabilities, net, consisted of the following as of December 31, 2018 and 2017 (amounts in thousands, except weighted average life amounts):
 
December 31, 2018
 
December 31, 2017
Below-market leases, net of accumulated amortization of $7,592 and $2,760, respectively (with a weighted average remaining life of 17.6 years and 18.7 years, respectively)
$
57,606

 
$
61,294


$
57,606

 
$
61,294

Schedule of Estimated Future Amortization Income of Below-Market Leases  
Estimated amortization of the below-market leases as of December 31, 2018, for each of the next five years ending December 31 and thereafter, are as follows (amounts in thousands):
Year
 
Amount
2019
 
$
4,927

2020
 
4,871

2021
 
4,843

2022
 
3,752

2023
 
3,091

Thereafter
 
36,122

 
 
$
57,606