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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, 2017 $ 509,077 $ 605 $ 585,488 $ (2,859) $ (74,157)
Beginning balance (in shares) at Dec. 31, 2017   60,518,000      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Common stock: class A shares issued related to public offering 79,165 $ 43 79,122    
Common stock: class A shares issued related to public offering (in shares)   4,255,000      
Common stock: class A shares issued related to warrants [1] $ 489   489    
Common stock: class A shares issued related to warrants (in shares) 25,686 26,000 [1]      
Common stock: class A shares issued under stock plans, net of shares withheld for employee taxes $ (991) $ 8 (999)    
Common stock: class A shares issued under stock plans, net of shares withheld for employee taxes (in shares)   770,000      
Share-based compensation expense 2,805   2,805    
Change in unrealized investment gains/losses, net of tax (10,956)     (10,956)  
Net income 22,355       22,355
Ending balance at Mar. 31, 2018 601,944 $ 656 666,905 (13,533) (52,084)
Ending balance (in shares) at Mar. 31, 2018   65,569,000      
Beginning balance at Dec. 31, 2017 $ 509,077 $ 605 585,488 (2,859) (74,157)
Beginning balance (in shares) at Dec. 31, 2017   60,518,000      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Common stock: class A shares issued related to warrants (in shares) 29,000        
Net income $ 47,596        
Ending balance at Jun. 30, 2018 629,642 $ 658 670,870 (15,043) (26,843)
Ending balance (in shares) at Jun. 30, 2018   65,754,000      
Beginning balance at Mar. 31, 2018 601,944 $ 656 666,905 (13,533) (52,084)
Beginning balance (in shares) at Mar. 31, 2018   65,569,000      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Common stock: class A shares issued related to warrants [1] $ 63   63    
Common stock: class A shares issued related to warrants (in shares) 3,751 3,000 [1]      
Common stock: class A shares issued under stock plans, net of shares withheld for employee taxes $ 887 $ 2 885    
Common stock: class A shares issued under stock plans, net of shares withheld for employee taxes (in shares)   182,000      
Share-based compensation expense 3,017   3,017    
Change in unrealized investment gains/losses, net of tax (1,510)     (1,510)  
Net income 25,241       25,241
Ending balance at Jun. 30, 2018 629,642 $ 658 670,870 (15,043) (26,843)
Ending balance (in shares) at Jun. 30, 2018   65,754,000      
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 warrants [2] $ 944   944    
Common stock: class A shares issued related to warrants (in shares) 39,195 39,000 [2]      
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 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, 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 warrants (in shares) 168,000        
Net income $ 71,999        
Ending balance at Jun. 30, 2019 812,379 $ 677 692,163 14,052 105,487
Ending balance (in shares) at Jun. 30, 2019   67,768,000      
Beginning balance at Mar. 31, 2019 751,881 $ 675 684,635 184 66,387
Beginning balance (in shares) at Mar. 31, 2019   67,502,000      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Common stock: class A shares issued related to warrants 3,836 $ 1 3,835    
Common stock: class A shares issued related to warrants (in shares)   128,000      
Common stock: class A shares issued under stock plans, net of shares withheld for employee taxes 219 $ 1 218    
Common stock: class A shares issued under stock plans, net of shares withheld for employee taxes (in shares)   138,000      
Share-based compensation expense 3,475   3,475    
Change in unrealized investment gains/losses, net of tax 13,868     13,868  
Net income 39,100       39,100
Ending balance at Jun. 30, 2019 $ 812,379 $ 677 $ 692,163 $ 14,052 $ 105,487
Ending balance (in shares) at Jun. 30, 2019   67,768,000      
[1]
During the three months ended March 31, 2018 and June 30, 2018, we issued 25,686 and 3,751 common shares, respectively, with a par value of $0.01 related to the exercise of warrants, which is not identifiable in this schedule due to rounding.
[2]
During the three months ended March 31, 2019, we issued 39,195 common shares with a par value of $0.01 related to the exercise of warrants, which is not identifiable in this schedule due to rounding.