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Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Cumulative Effect, Period of Adoption, Adjustment [Member] Common Stock [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] Additional Paid-in Capital [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] Retained Earnings [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Total
--- | --- | --- | --- | --- | --- | --- | --- | ---
Balance (in shares) at Dec. 31, 2017 |  |  |  |  | 81,800,000 |  |  |
Balance at Dec. 31, 2017 | $ 0 | $ 0 | $ 485 | $ 485 | $ 818 | $ 76,413 | $ 448,269 | $ 525,500
Net income |  |  |  |  | $ 0 | 0 | 55,027 | 55,027
Repurchase and retirement of common stock (in shares) |  |  |  |  | (300,000) |  |  |
Repurchase and retirement of common stock |  |  |  |  | $ (3) | (3,754) |  | (3,756)
Repurchase and retirement of common stock |  |  |  |  |  |  | 1 |
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards (in shares) |  |  |  |  | 200,000 |  |  |
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards |  |  |  |  | $ 2 | 936 | 0 | 938
Employee taxes paid in exchange for shares withheld |  |  |  |  | 0 | (104) | 0 | (104)
Share-based payment arrangement compensation expense |  |  |  |  | 0 | 3,323 | 0 | 3,323
Dividends on common stock |  |  |  |  | $ 0 | 0 | (5,459) | (5,459)
Balance (in shares) at Dec. 31, 2018 |  |  |  |  | 81,700,000 |  |  |
Balance at Dec. 31, 2018 |  |  |  |  | $ 817 | 76,814 | 498,323 | 575,954
Net income |  |  |  |  | $ 0 | 0 | 61,071 | $ 61,071
Repurchase and retirement of common stock (in shares) |  |  |  |  |  |  |  | 0
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards (in shares) |  |  |  |  | 355,000 |  |  |
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards |  |  |  |  | $ 4 | 1,618 | (2) | $ 1,620
Employee taxes paid in exchange for shares withheld |  |  |  |  | 0 | (784) | 0 | (784)
Share-based payment arrangement compensation expense |  |  |  |  | 0 | 1,817 | 0 | 1,817
Dividends on common stock |  |  |  |  | $ 0 | 0 | (42,089) | (42,089)
Balance (in shares) at Dec. 31, 2019 |  |  |  |  | 82,055,000 |  |  |
Balance at Dec. 31, 2019 |  |  |  |  | $ 821 | 79,465 | 517,303 | 597,589
Net income |  |  |  |  | $ 0 | 0 | 69,500 | 69,500
Repurchase and retirement of common stock (in shares) |  |  |  |  | (53) |  |  |
Repurchase and retirement of common stock |  |  |  |  | $ (1) | (596) | 0 | (597)
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards (in shares) |  |  |  |  | 703,000 |  |  |
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards |  |  |  |  | $ 7 | 4,787 | (1) | 4,793
Employee taxes paid in exchange for shares withheld |  |  |  |  | 0 | (437) | 0 | (437)
Share-based payment arrangement compensation expense |  |  |  |  | 0 | 1,851 | 0 | 1,851
Dividends on common stock |  |  |  |  | $ 0 | 0 | (52,366) | (52,366)
Balance (in shares) at Dec. 31, 2020 |  |  |  |  | 82,705,000 |  |  |
Balance at Dec. 31, 2020 |  |  |  |  | $ 827 | $ 85,070 | $ 534,436 | $ 620,333

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