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CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (UNAUDITED) - 9 months ended Sep. 27, 2017 - 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 Loss
Non- Controlling Interest
Beginning balance (shares) at Dec. 28, 2016   25,151,384 11,253,592 25,151,384 11,253,592        
Beginning balance at Dec. 28, 2016 $ 201,353     $ 25 $ 11 $ 135,448 $ 16,719 $ (15) $ 49,165
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net income 19,916           12,143   7,773
Other comprehensive loss:                  
Net unrealized losses related to available-for-sale securities 64             45 19
Equity-based compensation 3,909         3,909      
Activity under stock compensation plans (in shares)       323,927          
Activity under stock compensation plans 6,251     $ 1   3,580     2,670
Redemption of LLC Interests (in shares)       685,800 (685,800)        
Redemption of LLC Interests 0     $ 0 $ 0 2,883     (2,883)
Establishment of liabilities under tax receivable agreement and related changes to deferred tax assets associated with increases in tax basis 2,070         2,070      
Distributions paid to non-controlling interest holders (1,785)               1,785
Ending balance (shares) at Sep. 27, 2017   26,161,111 10,567,792 26,161,111 10,567,792        
Ending balance at Sep. 27, 2017 $ 231,778     $ 26 $ 11 $ 147,890 $ 28,862 $ 30 $ 54,959