Leases (Tables)
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Leases [Abstract]    
Schedule of Future Minimum Rent to Lessor from Operating Leases
Future minimum rent to be received from the Company's investments in real estate assets under the terms of non-cancelable operating leases in effect as of March 31, 2019, including optional renewal periods for the nine months ending December 31, 2019, and for each of the next four years ending December 31 and thereafter, are as follows (amounts in thousands):
Year
 
Amount
Nine months ending December 31, 2019
 
$
109,153

2020
 
146,830

2021
 
149,142

2022
 
144,560

2023
 
141,915

Thereafter
 
1,005,068

 
 
$
1,696,668

 
Schedule of Future Minimum Rent from Lessee for Ground Leases
The future minimum rent obligations, discounted by the Company's adjusted incremental borrowing rates, under non-cancelable ground leases, for the nine months ending December 31, 2019, and for each of the next four years ending December 31 and thereafter, are as follows (amounts in thousands):
Year
 
Amount
Nine months ending December 31, 2019
 
$
402

2020
 
536

2021
 
536

2022
 
536

2023
 
536

Thereafter
 
70,165

Total undiscounted rental payments
 
72,711

Less imputed interest
 
(63,961
)
Total operating lease liabilities
 
$
8,750

 
Schedule of Future Minimum Rent from Lessee for Ground Leases - ASC 840
The following represents approximate future minimum rent obligations under non-cancelable ground leases by year as of December 31, 2018, and for each of the next four years ending December 31 and thereafter, are as follows (amounts in thousands):
Year
 
Amount
2019
 
$
123

2020
 
123

2021
 
123

2022
 
123

2023
 
123

Thereafter
 
2,246

Total undiscounted rental payments
 
$
2,861

This table excludes future lease payment obligations from one tenant that pays the ground lease obligations directly to the lessor, consistent with the Company's accounting policy prior to its adoption of ASC 842 on January 1, 2019.
The future minimum rent obligations under non-cancelable ground leases as of December 31, 2018, for each of the next five years ended December 31 and thereafter, are as follows (amounts in thousands):
Year
 
Amount
2019
 
$
123

2020
 
123

2021
 
123

2022
 
123

2023
 
123

Thereafter
 
2,246

 
 
$
2,861