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Consolidated Statement of Shareholders' Equity - 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 | 72,081 |  |  |  | 72,081 |
Fair value over carrying value of preferred share redeemed |  | $ 2,257 |  |  | (2,257) |
Dividends declared to preferred shareholders | (3,656) |  |  |  | (3,656) |
Common share issuance for conversion of convertible notes - shares |  |  | 2,415,903 |  |  |
Common share issuance for conversion of convertible notes - value | 57,500 |  | $ 24 | 57,476 |  |
Preferred shares redeemed - shares |  | (2,000) |  |  |  |
Preferred shares redeemed - value | (50,420) | $ (50,420) |  |  |  |
Stock options exercised - shares |  |  | 678,781 |  |  |
Stock options exercised - value | 11,225 |  |  | (2,255) |  | 13,480
Stock-based compensation expense | 6,044 |  |  | 6,044 |  |
Deferral of Executive and Director Compensation | 350 |  |  | 350 |  |
Deferred Compensation Arrangement with Individual, Shares Issued |  | 0 | 84,635 |  |  |
Deferred Compensation Arrangement with Individual, Distribution Paid | 0 |  |  | (1,681) |  | 1,681
Shares Outstanding, Ending Balance at Dec. 31, 2017 |  | 0 | 27,856,752 |  |  |
Stockholders' Equity, Ending Balance at Dec. 31, 2017 | 747,298 | $ 0 | $ 295 | 306,483 | 473,329 | (32,809)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 107,663 |  |  |  | 107,663 |
Common share issuance for conversion of convertible notes - shares |  | 0 | 628,515 |  |  |
Common share issuance for conversion of convertible notes - value | 20,309 | $ 0 | $ 6 | 20,303 | 0 | 0
Treasury Stock, Shares, Acquired |  |  | (1,069,043) |  |  |
Treasury Stock, Value, Acquired, Cost Method | (25,709) |  |  |  |  | (25,709)
Stock options exercised - shares |  |  | 38,628 |  |  |
Stock options exercised - value | 538 |  |  | (254) |  | 792
Stock-based compensation expense | 5,974 |  |  | 5,974 |  |
Deferral of Executive and Director Compensation | 185 |  |  | 185 |  |
Deferred Compensation Arrangement with Individual, Shares Issued |  | 0 | 61,366 |  |  |
Deferred Compensation Arrangement with Individual, Distribution Paid | (955) |  |  | (2,174) |  | 1,219
Shares Outstanding, Ending Balance at Dec. 31, 2018 |  | 0 | 27,516,218 |  |  |
Stockholders' Equity, Ending Balance at Dec. 31, 2018 | 855,303 | $ 0 | $ 301 | 330,517 | 580,992 | (56,507)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | $ 127,587 |  |  |  | 127,587 |
Treasury Stock, Shares, Acquired | 200,000 |  | (201,088) |  |  |
Treasury Stock, Value, Acquired, Cost Method | $ (5,150) |  |  |  |  | (5,150)
Stock options exercised - shares | (954,370) |  | 954,370 |  |  |
Stock options exercised - value | $ 19,644 |  |  | (1,204) |  | 20,848
Stock-based compensation expense | 5,846 |  |  | 5,846 |  |
Deferral of Executive and Director Compensation | 247 |  |  | 247 |  |
Deferred Compensation Arrangement with Individual, Shares Issued |  | 0 | 116,956 |  |  |
Deferred Compensation Arrangement with Individual, Distribution Paid | 0 |  |  | (2,545) |  | 2,545
Shares Outstanding, Ending Balance at Dec. 31, 2019 |  | 0 | 28,386,456 |  |  |
Stockholders' Equity, Ending Balance at Dec. 31, 2019 | $ 1,003,477 | $ 0 | $ 301 | $ 332,861 | $ 708,579 | $ (38,264)

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