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Condensed Consolidated Statement of Shareholders' Equity - 6 months ended Jun. 30, 2017 - USD ($) $ in Thousands | Total | Preferred Shares [Member] | Common Shares [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Treasury Shares [Member]
--- | --- | --- | --- | --- | --- | ---
Shares Outstanding, Beginning Balance at Dec. 31, 2016 |  | 2,000 | 24,677,433 |  |  |
Stockholders' Equity, Beginning Balance at Dec. 31, 2016 | $ 654,174 | $ 48,163 | $ 271 | $ 246,549 | $ 407,161 | $ (47,970)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 33,872 |  |  |  | 33,872 |
Dividends declared to preferred shareholders | (2,438) |  |  |  | (2,438) |
Stock options exercised, shares |  |  | 342,661 |  |  |
Stock options exercised | 4,792 |  |  | (2,014) |  | 6,806
Stock-based compensation expense | 2,566 |  |  | 2,566 |  |
Deferral of executive and director compensation | 351 |  |  | 351 |  |
Executive and director deferred compensation distributions shares |  |  | 84,458 |  |  |
Executive and director deferred compensation distributions | 0 |  |  | (1,677) |  | 1,677
Shares Outstanding, Ending Balance at Jun. 30, 2017 |  | 2,000 | 25,104,552 |  |  |
Stockholders' Equity, Ending Balance at Jun. 30, 2017 | $ 693,317 | $ 48,163 | $ 271 | $ 245,775 | $ 438,595 | $ (39,487)

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