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Consolidated Statement of Equity - 3 months ended Mar. 31, 2018 - USD ($) $ in Thousands | Total | Dividend Distributions Payable | Series C Cumulative Preferred Stock | Series C Cumulative Preferred Stock Dividend Paid | Series C Cumulative Preferred Stock Dividend Distributions Payable | Series D Cumulative Redeemable Preferred Stock | Series D Cumulative Redeemable Preferred Stock Dividend Distributions Payable | Total Saul Centers, Inc. | Total Saul Centers, Inc. Dividend Distributions Payable | Total Saul Centers, Inc. Series C Cumulative Preferred Stock | Total Saul Centers, Inc. Series C Cumulative Preferred Stock Dividend Paid | Total Saul Centers, Inc. Series C Cumulative Preferred Stock Dividend Distributions Payable | Total Saul Centers, Inc. Series D Cumulative Redeemable Preferred Stock | Total Saul Centers, Inc. Series D Cumulative Redeemable Preferred Stock Dividend Distributions Payable | Preferred Stock | Preferred Stock Series C Cumulative Preferred Stock | Preferred Stock Series D Cumulative Redeemable Preferred Stock | Common Stock | Additional Paid-in Capital | Additional Paid-in Capital Series C Cumulative Preferred Stock | Additional Paid-in Capital Series D Cumulative Redeemable Preferred Stock | Accumulated Deficit | Accumulated Deficit Dividend Distributions Payable | Accumulated Deficit Series C Cumulative Preferred Stock | Accumulated Deficit Series C Cumulative Preferred Stock Dividend Paid | Accumulated Deficit Series C Cumulative Preferred Stock Dividend Distributions Payable | Accumulated Deficit Series D Cumulative Redeemable Preferred Stock Dividend Distributions Payable | Accumulated Other Comprehensive (Loss) | Noncontrolling Interest | Noncontrolling Interest Dividend Distributions Payable
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Beginning Balance at Dec. 31, 2017 | $ 393,103 |  |  |  |  |  |  | $ 334,405 |  |  |  |  |  |  | $ 180,000 |  |  | $ 221 | $ 352,590 |  |  | $ (197,710) |  |  |  |  |  | $ (696) | $ 58,698 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of 30,000 shares of Series D Cumulative preferred stock |  |  |  |  |  | $ 72,369 |  |  |  |  |  |  | $ 72,369 |  |  |  | $ 75,000 |  |  |  | $ (2,631) |  |  |  |  |  |  |  |  |
Redemption of 30,000 shares of Series C Cumulative preferred stock |  |  | $ (75,017) |  |  |  |  |  |  | $ (75,017) |  |  |  |  |  | $ (75,000) |  |  |  | $ 2,311 |  |  |  | $ (2,328) |  |  |  |  |  |
Issuance of common stock: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
69,750 shares pursuant to dividend reinvestment plan | 3,677 |  |  |  |  |  |  | 3,677 |  |  |  |  |  |  |  |  |  | 1 | 3,676 |  |  |  |  |  |  |  |  |  |  |
8,088 shares due to exercise of employee stock options and issuance of directors’ deferred shares | 769 |  |  |  |  |  |  | 769 |  |  |  |  |  |  |  |  |  | 0 | 769 |  |  |  |  |  |  |  |  |  |  |
Issuance of 38,037 partnership units pursuant to dividend reinvestment plan | 2,017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,017 |
Net income | 14,947 |  |  |  |  |  |  | 12,588 |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,588 |  |  |  |  |  |  | 2,359 |
Change in unrealized loss on cash flow hedge | 389 |  |  |  |  |  |  | 289 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 289 | 100 |
Preferred stock distributions |  |  |  | $ (730) | $ (1,805) |  | $ (868) |  |  |  | $ (730) | $ (1,805) |  | $ (868) |  |  |  |  |  |  |  |  |  |  | $ (730) | $ (1,805) | $ (868) |  |  |
Common stock distributions |  | $ (15,494) |  |  |  |  |  |  | $ (11,552) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (11,552) |  |  |  |  |  |  | $ (3,942)
Ending Balance at Mar. 31, 2018 | $ 393,357 |  |  |  |  |  |  | $ 334,125 |  |  |  |  |  |  | $ 180,000 |  |  | $ 222 | $ 356,715 |  |  | $ (202,405) |  |  |  |  |  | $ (407) | $ 59,232 |

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