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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2016
Accounting Policies [Abstract]  
Schedule of construction in progress
The following table shows the components of construction in progress.
 
 
December 31,
(in thousands)
 
2016
 
2015
 
 
 
 
 
Park Van Ness
 
$
—

 
$
77,245

N. Glebe Road
 
58,147

 
—

Other
 
5,423

 
6,271

Total
 
$
63,570

 
$
83,516

 
 
 
 
 
Allowance for doubtful accounts
Accounts receivable in the accompanying consolidated financial statements are shown net of an allowance for doubtful accounts of $2.0 million and $1.3 million, at December 31, 2016 and 2015, respectively.
 
(In thousands)
Year ended December 31,
 
2016
 
2015
 
2014
Beginning Balance
$
1,263

 
$
677

 
$
572

Provision for Credit Losses
1,494

 
915

 
680

Charge-offs
(799
)
 
(329
)
 
(575
)
Ending Balance
$
1,958

 
$
1,263

 
$
677
Basic and diluted shares outstanding
 
December 31,
(Shares in thousands)
2016
 
2015
 
2014
Weighted average common shares outstanding - Basic
21,505

 
21,127

 
20,772

Effect of dilutive options
110

 
69

 
49

Weighted average common shares outstanding - Diluted
21,615

 
21,196

 
20,821

Average share price
$
58.96

 
$
53.38

 
$
49.09

Non-dilutive options
129

 
111

 
107

Years non-dilutive options were issued
2007, 2015, and 2016
 
2007 and 2015
 
2007 and 2008