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Condensed Consolidated Statements of Shareholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Income (Loss)
Retained Earnings
Total Granite Shareholders’ Equity
Non-controlling Interests
Beginning balances (in shares) at Dec. 31, 2024   43,424,646          
Beginning balances at Dec. 31, 2024 $ 1,079,363 $ 434 $ 410,739 $ (582) $ 604,635 $ 1,015,226 $ 64,137
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net loss (28,327)       (33,656) (33,656) 5,329
Other comprehensive income 647     647   647  
Repurchases of common stock (shares) [1]   (198,220)          
Repurchases of common stock [1] (15,209) $ (2) (15,207)   0 (15,209)  
RSUs vested (shares)   511,611          
RSUs vested 0 $ 5 (5)        
Dividends on common stock (5,687)   69   (5,756) (5,687)  
Transactions with non-controlling interests (24,703)           (24,703)
Stock-based compensation expense and other (in shares)   (546)          
Stock-based compensation expense and other 32,208   32,208     32,208  
Ending balances (in shares) at Mar. 31, 2025   43,737,491          
Ending balances at Mar. 31, 2025 $ 1,038,292 $ 437 427,804 65 565,223 993,529 44,763
Beginning balances (in shares) at Dec. 31, 2025 43,496,781 43,496,781          
Beginning balances at Dec. 31, 2025 $ 1,221,533 $ 435 402,391 1,581 774,641 1,179,048 42,485
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net loss (36,389)       (41,699) (41,699) 5,310
Other comprehensive income 1,414     1,414   1,414  
Repurchases of common stock (shares) [1]   (154,201)          
Repurchases of common stock [1] (18,441) $ (2) (18,439)     (18,441)  
RSUs vested (shares)   404,349          
RSUs vested 0 $ 4 (4)        
Repurchase of 3.75% Convertible Notes (178,804)   (178,804)     (178,804)  
Dividends on common stock (5,687)   65   (5,752) (5,687)  
Partial unwind of capped call 55,112   55,112     55,112  
Transactions with non-controlling interests 1,124           1,124
Stock-based compensation expense and other (in shares)   (505)          
Stock-based compensation expense and other $ 41,178   41,178     41,178  
Ending balances (in shares) at Mar. 31, 2026 43,746,424 43,746,424          
Ending balances at Mar. 31, 2026 $ 1,081,040 $ 437 $ 301,499 $ 2,995 $ 727,190 $ 1,032,121 $ 48,919
[1] Represents shares withheld related to employee taxes for RSUs vested under our equity incentive plans in 2026 and 2025, as well as 200 shares repurchased under our share repurchase program in 2025.