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

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