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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) - USD ($)
$ in Thousands
Total
Common Stock - Class A
Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Retained Earnings
Beginning balance at Dec. 31, 2018 $ 701,500 $ 663 $ 682,181 $ (14,832) $ 33,488
Beginning balance (in shares) at Dec. 31, 2018   66,319,000      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Common stock: class A shares issued related to warrant exercises $ 944   944    
Common stock: class A shares issued related to warrants (in shares) 39,195 39,000      
Common stock: class A shares issued under stock plans, net of shares withheld for employee taxes $ (1,459) $ 12 (1,471)    
Common stock: class A shares issued under stock plans, net of shares withheld for employee taxes (in shares)   1,144,000      
Share-based compensation expense 2,981   2,981    
Change in unrealized investment gains/losses, net of tax benefit/expense 15,016     15,016  
Net income 32,899       32,899
Ending balance at Mar. 31, 2019 751,881 $ 675 684,635 184 66,387
Ending balance (in shares) at Mar. 31, 2019   67,502,000      
Beginning balance at Dec. 31, 2019 930,420 $ 684 707,003 17,288 205,445
Beginning balance (in shares) at Dec. 31, 2019   68,358,000      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Common stock: class A shares issued related to warrant exercises $ 221   221    
Common stock: class A shares issued related to warrants (in shares) 6,474 6,000      
Common stock: class A shares issued under stock plans, net of shares withheld for employee taxes $ (3,750) $ 5 (3,755)    
Common stock: class A shares issued under stock plans, net of shares withheld for employee taxes (in shares)   510,000      
Share-based compensation expense 2,552   2,552    
Change in unrealized investment gains/losses, net of tax benefit/expense (12,824)     (12,824)  
Net income 58,271       58,271
Ending balance at Mar. 31, 2020 $ 974,890 $ 689 $ 706,021 $ 4,464 $ 263,716
Ending balance (in shares) at Mar. 31, 2020   68,874,000