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Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Cumulative Effect, Period of Adoption, Adjustment [Member] Common Stock [Member] Common Class A [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] Common Stock [Member] Common Class B [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] Additional Paid-in Capital [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] Treasury Stock [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] AOCI Attributable to Parent [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] Retained Earnings [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Common Stock [Member] Common Class A [Member] | Common Stock [Member] Common Class B [Member] | Additional Paid-in Capital [Member] | Treasury Stock [Member] | AOCI Attributable to Parent [Member] | Retained Earnings [Member] | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balances at Dec. 31, 2017 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 592 | $ 592 | $ 171 | $ 24 | $ 137,242 | $ 0 | $ 293 | $ 157,471 | $ 295,201
Net (loss) income |  |  |  |  |  |  |  | 0 | 0 | 0 | 0 | 0 | 42,503 | 42,503
Other comprehensive loss |  |  |  |  |  |  |  | 0 | 0 | 0 | 0 | (89) | 0 | (89)
Stock-based employee compensation expense |  |  |  |  |  |  |  | 0 | 0 | 4,802 | 0 | 0 | 0 | 4,802
Issuance of restricted shares, net |  |  |  |  |  |  |  | 0 | 0 | 133 | 0 | 0 | 0 | 133
Balances at Dec. 31, 2018 |  |  |  |  |  |  |  | 171 | 24 | 142,177 | 0 | 204 | 200,566 | 343,142
Net (loss) income |  |  |  |  |  |  |  | 0 | 0 | 0 | 0 | 0 | 8,477 | 8,477
Other comprehensive loss |  |  |  |  |  |  |  | 0 | 0 | 0 | 0 | (1,218) | 0 | (1,218)
Stock-based employee compensation expense |  |  |  |  |  |  |  | 0 | 0 | 819 | 0 | 0 | 0 | 819
Issuance of restricted shares, net |  |  |  |  |  |  |  | 2 | 0 | (1,111) | 0 | 0 | 0 | (1,109)
Balances at Dec. 31, 2019 |  |  |  |  |  |  |  | 173 | 24 | 141,885 | 0 | (1,014) | 209,043 | 350,111
Net (loss) income |  |  |  |  |  |  |  | 0 | 0 | 0 | 0 | 0 | (42,718) | (42,718)
Other comprehensive loss |  |  |  |  |  |  |  | 0 | 0 | 0 | 0 | (1,237) | 0 | (1,237)
Stock-based employee compensation expense |  |  |  |  |  |  |  | 0 | 0 | 2,270 | 419 | 0 | 0 | 2,689
Issuance of restricted shares, net |  |  |  |  |  |  |  | 0 | 0 | (717) | 0 | 0 | 0 | (717)
Share repurchase |  |  |  |  |  |  |  | 0 | 0 | 0 | (17,486) | 0 | 0 | (17,486)
Balances at Dec. 31, 2020 |  |  |  |  |  |  |  | $ 173 | $ 24 | $ 143,438 | $ (17,067) | $ (2,251) | $ 166,325 | $ 290,642

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