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Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - 9 months ended Sep. 30, 2018 - USD ($) $ in Thousands | Common Stock [Member] Common Class A [Member] | Common Stock [Member] Common Class B [Member] | Additional Paid-in Capital [Member] | AOCI Attributable to Parent [Member] | Retained Earnings [Member] | Total
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2017 | $ 171 | $ 24 | $ 137,242 | $ 293 | $ 157,471 | $ 295,201
Net income |  |  |  |  | 26,002 | 26,002
Other comprehensive income |  |  |  | 1,194 |  | 1,194
Stock-based employee compensation expense |  |  | 2,868 |  |  | 2,868
Issuance of restricted shares |  |  | 294 |  |  | 294
Balance at Sep. 30, 2018 | $ 171 | $ 24 | $ 140,404 | $ 1,487 | 184,064 | 326,150
Effect of adoption of ASU 2014-09 |  |  |  |  | $ 591 | $ 591

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