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Condensed Consolidated Statement of Shareholders' Equity - 6 months ended Jun. 30, 2018 - USD ($) $ in Thousands | Total | Common Shares [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Treasury Shares [Member]
--- | --- | --- | --- | --- | ---
Shares Outstanding, Beginning Balance at Dec. 31, 2017 |  | 27,856,752 |  |  |
Stockholders' Equity, Beginning Balance at Dec. 31, 2017 | $ 747,298 | $ 295 | $ 306,483 | $ 473,329 | $ (32,809)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 45,974 |  |  | 45,974 |
Proceeds from issuance of common shares for conversion of convertible notes | 20,309 | $ 6 | 20,303 |  |
Common shares issued for conversion of convertible notes |  | 628,515 |  |  |
Stock options exercised, shares |  | 24,220 |  |  |
Stock options exercised | 426 |  | (56) |  | 482
Stock-based compensation expense | 2,730 |  | 2,730 |  |
Deferral of executive and director compensation | 184 |  | 184 |  |
Executive and director deferred compensation distributions shares |  | 61,366 |  |  |
Executive and director deferred compensation distributions | (955) |  | (2,174) |  | 1,219
Shares Outstanding, Ending Balance at Jun. 30, 2018 |  | 28,570,853 |  |  |
Stockholders' Equity, Ending Balance at Jun. 30, 2018 | $ 815,966 | $ 301 | $ 327,470 | $ 519,303 | $ (31,108)

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