Summary of Significant Accounting Policies (Tables)
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Accounting Policies [Abstract]    
Reconciliation of Cash, Cash Equivalents and Restricted Cash
The following table presents a reconciliation of the beginning of period and end of period cash, cash equivalents and restricted cash reported within the condensed consolidated balance sheets to the totals shown in the condensed consolidated statements of cash flows (amounts in thousands):
 
 
Three Months Ended
March 31,
Beginning of period:
 
2019
 
2018
Cash and cash equivalents
 
68,360

 
74,803

Restricted cash
 
11,167

 
10,944

Cash, cash equivalents and restricted cash
 
$
79,527

 
$
85,747

 
 
 
 
 
End of period:
 
 
 
 
Cash and cash equivalents
 
73,727

 
76,734

Restricted cash
 
11,614

 
12,885

Cash, cash equivalents and restricted cash
 
$
85,341

 
$
89,619
The following table presents a reconciliation of the beginning of year and end of year cash, cash equivalents and restricted cash reported within the consolidated balance sheets to the totals shown in the consolidated statements of cash flows (amounts in thousands):
 
 
For the Year Ended
December 31,
Beginning of year:
 
2018
 
2017
 
2016
Cash and cash equivalents
 
74,803

 
50,446

 
31,262

Restricted cash
 
10,944

 
6,463

 
1,927

Cash, cash equivalents and restricted cash
 
$
85,747

 
$
56,909

 
$
33,189

 
 
 
 
 
 
 
End of year:
 
 
 
 
 
 
Cash and cash equivalents
 
68,360

 
74,803

 
50,446

Restricted cash
 
11,167

 
10,944

 
6,463

Cash, cash equivalents and restricted cash
 
$
79,527

 
$
85,747

 
$
56,909
Schedule of Estimated Useful Lives of Assets by Class  
The Company anticipates the estimated useful lives of its assets by class as follows:
Buildings and improvements
 
15 – 40 years
Tenant improvements
 
Shorter of lease term or expected useful life
Furniture, fixtures, and equipment
 
3 – 10 years