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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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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

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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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