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CONDENSED CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands | Total | Capital Stock | Additional Paid-In Capital | Retained Earnings | Retained Earnings Cumulative Effect, Period of Adoption, Adjustment | Accumulated Other Comprehensive Loss
--- | --- | --- | --- | --- | --- | ---
Balance, beginning of period at Dec. 31, 2018 |  | $ 18,395 | $ 132,360 | $ 776,403 | $ (20) | $ (78,834)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Shares issued for vested restricted stock units, net of shares withheld for taxes |  | 137 | (7,561) |  |  |
Stock options exercised |  | 10 | 317 |  |  |
Shares issued for employee stock purchase plan |  | 7 | 587 |  |  |
Shares issued to directors |  | 10 | (10) |  |  |
Equity compensation expense |  |  | 6,143 |  |  |
Net income | $ 52,692 |  |  | 52,692 |  |
Other comprehensive income (loss) | (3,122) |  |  |  |  | (3,122)
Balance, end of period at Jun. 30, 2019 | 897,514 | 18,559 | 131,836 | 829,075 |  | (81,956)
Balance, beginning of period at Mar. 31, 2019 |  | 18,546 | 128,417 | 804,782 | 0 | (83,423)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Shares issued for vested restricted stock units, net of shares withheld for taxes |  | 4 | (288) |  |  |
Stock options exercised |  | 2 | 40 |  |  |
Shares issued for employee stock purchase plan |  |  | 7 |  |  |
Shares issued to directors |  | 7 | (7) |  |  |
Equity compensation expense |  |  | 3,667 |  |  |
Net income | 24,293 |  |  | 24,293 |  |
Other comprehensive income (loss) | 1,467 |  |  |  |  | 1,467
Balance, end of period at Jun. 30, 2019 | $ 897,514 | 18,559 | 131,836 | 829,075 |  | (81,956)
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201602Member |  |  |  |  |
Balance, beginning of period at Dec. 31, 2019 | $ 933,900 | 18,577 | 138,526 | 823,702 | 0 | (46,905)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Shares issued for vested restricted stock units, net of shares withheld for taxes |  | 85 | (5,114) |  |  |
Shares issued for employee stock purchase plan |  | 6 | 658 |  |  |
Shares issued to directors |  | 0 |  |  |  |
Equity compensation expense |  |  | 7,022 |  |  |
Net income | 27,779 |  |  | 27,779 |  |
Other comprehensive income (loss) | (1,754) |  |  |  |  | (1,754)
Balance, end of period at Jun. 30, 2020 | 962,582 | 18,668 | 141,092 | 851,481 |  | (48,659)
Balance, beginning of period at Mar. 31, 2020 |  | 18,662 | 137,235 | 836,961 | $ 0 | (55,049)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Shares issued for vested restricted stock units, net of shares withheld for taxes |  | 6 | (38) |  |  |
Equity compensation expense |  |  | 3,895 |  |  |
Net income | 14,520 |  |  | 14,520 |  |
Other comprehensive income (loss) | 6,390 |  |  |  |  | 6,390
Balance, end of period at Jun. 30, 2020 | $ 962,582 | $ 18,668 | $ 141,092 | $ 851,481 |  | $ (48,659)

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