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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Capital Stock | Additional Paid-In Capital | Retained Earnings | Retained Earnings Cumulative-effect adjustment | Accumulated Other Comprehensive Loss
--- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2017 |  | $ 18,255 | $ 128,933 | $ 684,540 |  | $ (65,155)
Beginning Balance (Cumulative-effect adjustment for revenue recognition) at Dec. 31, 2017 |  |  |  |  | $ 4,212 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Shares issued for vested restricted stock units, net of shares withheld for taxes |  | 117 | (6,717) |  |  |
Net income | $ 87,651 |  |  | 87,651 |  |
Stock options exercised |  | 22 | 839 |  |  |
Shares issued for employee stock purchase plan |  | 12 | 1,070 |  |  |
Shares issued to directors |  | 12 | (12) |  |  |
Shares repurchased | (2,999) | (23) | (2,976) |  |  |
Equity compensation expense |  |  | 11,223 |  |  |
Other comprehensive income (loss) | (13,679) |  |  |  |  | (13,679)
Ending Balance at Dec. 31, 2018 | 848,324 | 18,395 | 132,360 | 776,403 |  | (78,834)
Ending Balance (Cumulative-effect adjustment for lease accounting) at Dec. 31, 2018 |  |  |  |  | $ (20) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Shares issued for vested restricted stock units, net of shares withheld for taxes |  | 144 | (7,694) |  |  |
Net income | 47,319 |  |  | 47,319 |  |
Stock options exercised |  | 11 | 333 |  |  |
Shares issued for employee stock purchase plan |  | 15 | 1,234 |  |  |
Shares issued to directors |  | 12 | (12) |  |  |
Shares repurchased | 0 | 0 | 0 |  |  |
Equity compensation expense |  |  | 12,305 |  |  |
Other comprehensive income (loss) | 31,929 |  |  |  |  | 31,929
Ending Balance at Dec. 31, 2019 | 933,900 | 18,577 | 138,526 | 823,702 |  | (46,905)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Shares issued for vested restricted stock units, net of shares withheld for taxes |  | 82 | (5,439) |  |  |
Net income | 49,990 |  |  | 49,990 |  |
Stock options exercised |  | 0 | 0 |  |  |
Shares issued for employee stock purchase plan |  | 13 | 1,347 |  |  |
Shares issued to directors |  | 5 | (5) |  |  |
Shares repurchased | 0 | 0 | 0 |  |  |
Equity compensation expense |  |  | 13,532 |  |  |
Other comprehensive income (loss) | 27,330 |  |  |  |  | 27,330
Ending Balance at Dec. 31, 2020 | $ 1,020,755 | $ 18,677 | $ 147,961 | $ 873,692 |  | $ (19,575)

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