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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' AND MEMBERS' EQUITY - USD ($) $ in Thousands | Total | Class A Common Stock | Class B Common Stock | Common stock Class A Common Stock | Common stock Class B Common Stock | Additional Paid-In Capital | Retained Earnings | Accumulated Other Comprehensive Income (Loss) | Non- Controlling Interest | Secondary Offering and Redemption of Units | Secondary Offering and Redemption of Units Common stock Class A Common Stock | Secondary Offering and Redemption of Units Common stock Class B Common Stock | Secondary Offering and Redemption of Units Additional Paid-In Capital | Secondary Offering and Redemption of Units Non- Controlling Interest
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Beginning balance at Dec. 30, 2015 | $ 157,019 |  |  | $ 20 | $ 16 | $ 96,311 | $ 4,273 | $ (5) | $ 56,404 |  |  |  |  |
Beginning balance (in shares) at Dec. 30, 2015 |  |  |  | 19,789,259 | 16,460,741 |  |  |  |  |  |  |  |  |
Other comprehensive loss: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net unrealized losses related to available-for-sale securities | (16) |  |  |  |  |  |  | (10) | (6) |  |  |  |  |
Equity-based compensation | 5,493 |  |  |  |  | 5,493 |  |  |  |  |  |  |  |
Establishment of liabilities under tax receivable agreement and related changes to deferred tax assets associated with increases in tax basis | 15,833 |  |  |  |  | 15,833 |  |  |  |  |  |  |  |
Redemptions (in shares) |  |  |  |  |  |  |  |  |  |  | (5,207,149) | (5,207,149) |  |
Redemptions |  |  |  |  |  |  |  |  |  | $ 0 | $ 5 | $ (5) | $ 16,986 | $ (16,986)
Net income | 22,146 |  |  |  |  |  | 12,446 |  | 9,700 |  |  |  |  |
Stock option exercises (in shares) |  |  |  | 154,976 |  |  |  |  |  |  |  |  |  |
Stock option exercises | 3,197 |  |  | $ 0 |  | 795 |  |  | 2,402 |  |  |  |  |
Income tax effect of stock compensation plans | 33 |  |  |  |  | 30 |  |  | 3 |  |  |  |  |
Distributions paid and payable to non-controlling interest holders | (2,352) |  |  |  |  |  |  |  | (2,352) |  |  |  |  |
Ending balance at Dec. 28, 2016 | 201,353 |  |  | $ 25 | $ 11 | 135,448 | 16,719 | (15) | 49,165 |  |  |  |  |
Ending balance (in shares) at Dec. 28, 2016 |  |  |  | 25,151,384 | 11,253,592 |  |  |  |  |  |  |  |  |
Other comprehensive loss: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net unrealized losses related to available-for-sale securities | (47) |  |  |  |  |  |  | (34) | (13) |  |  |  |  |
Equity-based compensation | 5,732 |  |  |  |  | 5,732 |  |  |  |  |  |  |  |
Establishment of liabilities under tax receivable agreement and related changes to deferred tax assets associated with increases in tax basis | 3,059 |  |  |  |  | 3,059 |  |  |  |  |  |  |  |
Redemptions (in shares) |  |  |  | (1,003,585) |  |  |  |  |  |  | (1,003,585) | (1,003,585) |  |
Redemptions |  |  |  |  |  |  |  |  | (4,415) | 0 | $ 1 | $ (1) | 4,415 |
Net income | 8,884 |  |  |  |  |  | (320) |  | 9,204 |  |  |  |  |
Stock option exercises (in shares) |  |  |  | 372,508 |  |  |  |  |  |  |  |  |  |
Stock option exercises | 7,270 |  |  | $ 1 |  | 4,451 |  |  | 2,818 |  |  |  |  |
Distributions paid and payable to non-controlling interest holders | (1,772) |  |  |  |  |  |  |  | (1,772) |  |  |  |  |
Ending balance at Dec. 27, 2017 | 224,479 |  |  | $ 27 | $ 10 | 153,105 | 16,399 | (49) | 54,987 |  |  |  |  |
Ending balance (in shares) at Dec. 27, 2017 |  | 26,527,477 | 10,250,007 | 26,527,477 | 10,250,007 |  |  |  |  |  |  |  |  |
Other comprehensive loss: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 4,979 |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance at Dec. 27, 2017 | 224,479 |  |  | $ 27 | $ 10 | 153,105 | 16,399 | (49) | 54,987 |  |  |  |  |
Beginning balance (in shares) at Dec. 27, 2017 |  | 26,527,477 | 10,250,007 | 26,527,477 | 10,250,007 |  |  |  |  |  |  |  |  |
Other comprehensive loss: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net unrealized losses related to available-for-sale securities | 13 |  |  |  |  |  |  | 10 | 3 |  |  |  |  |
Equity-based compensation | 6,250 |  |  |  |  | 6,250 |  |  |  |  |  |  |  |
Establishment of liabilities under tax receivable agreement and related changes to deferred tax assets associated with increases in tax basis | 18,567 |  |  |  |  | 18,567 |  |  |  |  |  |  |  |
Redemptions (in shares) |  |  |  | (2,692,660) |  |  |  |  |  |  | (2,692,660) | (2,692,660) |  |
Redemptions |  |  |  |  |  |  |  |  | (15,202) | $ 0 | $ 2 | $ (2) | $ 15,202 |
Net income | 21,948 |  |  |  |  |  | 15,179 |  | 6,769 |  |  |  |  |
Stock option exercises (in shares) |  |  |  | 300,696 |  |  |  |  |  |  |  |  |  |
Stock option exercises | 4,523 |  |  | $ 1 |  | 2,509 |  |  | 2,013 |  |  |  |  |
Distributions paid and payable to non-controlling interest holders | (751) |  |  |  |  |  |  |  | (751) |  |  |  |  |
Ending balance at Dec. 26, 2018 | 273,455 |  |  | $ 30 | $ 8 | $ 195,633 | 30,404 | 0 | 47,380 |  |  |  |  |
Ending balance (in shares) at Dec. 26, 2018 |  | 29,520,833 | 7,557,347 | 29,520,833 | 7,557,347 |  |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | $ (1,574) |  |  |  |  |  | $ (1,174) | $ 39 | $ (439) |  |  |  |  |

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