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CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Treasury Stock | Retained Earnings | Class A Common Stock | Class B Common Stock
--- | --- | --- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Sep. 30, 2017 |  | 44,987,575 |  |  |  | 0 | 0
Beginning balance at Sep. 30, 2017 | $ 152,181 | $ 45 | $ 142,385 | $ (11,983) | $ 21,734 | $ 0 | $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 10,996 |  |  |  | 10,996 |  |
Ending balance (in shares) at Dec. 31, 2017 |  | 44,987,575 |  |  |  | 0 | 0
Ending balance at Dec. 31, 2017 | 163,177 | $ 45 | 142,385 | (11,983) | 32,730 | $ 0 | $ 0
Beginning balance (in shares) at Sep. 30, 2017 |  | 44,987,575 |  |  |  | 0 | 0
Beginning balance at Sep. 30, 2017 | 152,181 | $ 45 | 142,385 | (11,983) | 21,734 | $ 0 | $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 35,647 |  |  |  |  |  |
Ending balance (in shares) at Jun. 30, 2018 |  | 0 |  |  |  | 11,950,000 | 42,387,571
Ending balance at Jun. 30, 2018 | 284,325 | $ 0 | 242,493 | (15,603) | 57,381 | $ 12 | $ 42
Beginning balance (in shares) at Dec. 31, 2017 |  | 44,987,575 |  |  |  | 0 | 0
Beginning balance at Dec. 31, 2017 | 163,177 | $ 45 | 142,385 | (11,983) | 32,730 | $ 0 | $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 11,248 |  |  |  | 11,248 |  |
Equity-based compensation expense | 604 |  | 604 |  |  |  |
Issuance of restricted shares from treasury | 5 |  | (453) | 458 |  |  |
Ending balance (in shares) at Mar. 31, 2018 |  | 44,987,575 |  |  |  | 0 | 0
Ending balance at Mar. 31, 2018 | 175,034 | $ 45 | 142,536 | (11,525) | 43,978 | $ 0 | $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 13,403 |  |  |  | 13,403 |  |
Equity-based compensation expense | 371 |  | 371 |  |  |  |
Issuance of stock (in shares) |  |  |  |  |  | 9,350,000 |
Issuance of stock | 98,009 |  | 98,000 |  |  | $ 9 |
Conversion of Class B Shares to Class A Shares (in shares) |  |  |  |  |  | 2,600,000 | 2,600,000
Conversion of Class B common stock to Class A common stock | 0 |  |  |  |  | $ 3 | $ (3)
Reclassification of common stock (in shares) |  | 44,987,575 |  |  |  |  | 44,987,571
Reclassification of common stock | 0 | $ (45) |  |  |  |  | $ 45
Cashless option exercise | (2,492) |  | 1,586 | (4,078) |  |  |
Ending balance (in shares) at Jun. 30, 2018 |  | 0 |  |  |  | 11,950,000 | 42,387,571
Ending balance at Jun. 30, 2018 | 284,325 | $ 0 | 242,493 | (15,603) | 57,381 | $ 12 | $ 42
Beginning balance (in shares) at Sep. 30, 2018 |  | 0 |  |  |  | 11,950,000 | 42,387,571
Beginning balance at Sep. 30, 2018 | 299,469 | $ 0 | 242,493 | (15,603) | 72,525 | $ 12 | $ 42
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 5,154 |  |  |  | 5,154 |  |
Ending balance (in shares) at Dec. 31, 2018 |  | 0 |  |  |  | 11,950,000 | 42,387,571
Ending balance at Dec. 31, 2018 | 304,623 | $ 0 | 242,493 | (15,603) | 77,679 | $ 12 | $ 42
Beginning balance (in shares) at Sep. 30, 2018 |  | 0 |  |  |  | 11,950,000 | 42,387,571
Beginning balance at Sep. 30, 2018 | 299,469 | $ 0 | 242,493 | (15,603) | 72,525 | $ 12 | $ 42
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 26,568 |  |  |  |  |  |
Ending balance (in shares) at Jun. 30, 2019 |  | 0 |  |  |  | 32,442,545 | 22,162,369
Ending balance at Jun. 30, 2019 | 326,183 | $ 0 | 242,639 | (15,603) | 99,093 | $ 32 | $ 22
Beginning balance (in shares) at Dec. 31, 2018 |  | 0 |  |  |  | 11,950,000 | 42,387,571
Beginning balance at Dec. 31, 2018 | 304,623 | $ 0 | 242,493 | (15,603) | 77,679 | $ 12 | $ 42
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 4,212 |  |  |  | 4,212 |  |
Ending balance (in shares) at Mar. 31, 2019 |  | 0 |  |  |  | 11,950,000 | 42,387,571
Ending balance at Mar. 31, 2019 | 308,835 | $ 0 | 242,493 | (15,603) | 81,891 | $ 12 | $ 42
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 17,202 |  |  |  | 17,202 |  |
Equity-based compensation expense | 146 |  | 146 |  |  |  |
Issuance of stock (in shares) |  |  |  |  |  | 267,343 |
Issuance of stock | 0 |  |  |  |  |  |
Conversion of Class B Shares to Class A Shares (in shares) |  |  |  |  |  | 20,225,202 | 20,225,202
Conversion of Class B common stock to Class A common stock | 0 |  |  |  |  | $ 20 | $ (20)
Ending balance (in shares) at Jun. 30, 2019 |  | 0 |  |  |  | 32,442,545 | 22,162,369
Ending balance at Jun. 30, 2019 | $ 326,183 | $ 0 | $ 242,639 | $ (15,603) | $ 99,093 | $ 32 | $ 22

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