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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2018
Accounting Policies [Abstract]  
Schedule of construction in progress
The following table shows the components of construction in progress.
 
 
December 31,
(in thousands)
 
2018
 
2017
 
 
 
 
 
N. Glebe Road
 
$
162,176

 
$
83,462

Ashbrook Marketplace
 
11,124

 
—

Other
 
12,672

 
7,652

Total
 
$
185,972

 
$
91,114

 
 
 
 
 
Allowance for doubtful accounts
(In thousands)
Year ended December 31,
 
2018
 
2017
 
2016
Beginning Balance
$
405

 
$
1,958

 
$
1,263

Provision for Credit Losses
685

 
906

 
1,494

Charge-offs
(531
)
 
(2,459
)
 
(799
)
Ending Balance
$
559

 
$
405

 
$
1,958
Basic and diluted shares outstanding
 
December 31,
(Shares in thousands)
2018
 
2017
 
2016
Weighted average common shares outstanding - Basic
22,383

 
21,901

 
21,505

Effect of dilutive options
42

 
107

 
110

Weighted average common shares outstanding - Diluted
22,425

 
22,008

 
21,615

Average share price
$
52.50

 
$
61.63

 
$
58.96

Non-dilutive options
492

 
—

 
129

Years non-dilutive options were issued
2015, 2016 and 2017
 
 
 
2007, 2015, and 2016