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Consolidated Statements of Changes in Shareholders' Equity - (Unaudited) - USD ($)
$ in Thousands
Total
Cumulative Effect, Period of Adoption, Adjustment
Common Stock
Additional Paid In Capital
Retained Earnings
Retained Earnings
Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Income (Loss)
Beginning balance (in shares) at Dec. 31, 2019     33,241,496,000        
Beginning balance at Dec. 31, 2019 $ 1,190,681 $ (10,931) $ 331 $ 482,286 $ 705,105 $ (10,931) $ 2,959
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net Income 93,325       93,325    
Other comprehensive loss, net of tax 11,312           11,312
Stock-based compensation expense 3,874     3,874      
Vesting of time based stock awards issued at date of grant, net of shares withheld for payroll taxes (in shares)     (28,218,000)        
Vesting of performance based stock awards, net of shares withheld for payroll taxes (in shares)     4,126,000        
Time based stock awards granted (in shares)     176,252,000        
Issuance of common stock related to employee stock purchase plan (in shares)     17,821,000        
Issuance of common stock related to employee stock purchase plan 589     589      
Cash dividends declared (21,280)       (21,280)    
Common stock repurchased (in shares)     (1,182,841,000)        
Common stock repurchased (44,168)   $ (11) (44,157)      
Ending balance (in shares) at Sep. 30, 2020     32,228,636,000        
Ending balance at Sep. 30, 2020 1,223,402   $ 320 442,592 766,219   14,271
Beginning balance (in shares) at Jun. 30, 2020     32,224,756,000        
Beginning balance at Jun. 30, 2020 1,187,895   $ 320 440,934 731,973   14,668
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net Income 41,346       41,346    
Other comprehensive loss, net of tax (397)           (397)
Stock-based compensation expense 1,452     1,452      
Vesting of time based stock awards issued at date of grant, net of shares withheld for payroll taxes (in shares)     (3,297,000)        
Time based stock awards granted (in shares)     0        
Issuance of common stock related to employee stock purchase plan (in shares)     7,177,000        
Issuance of common stock related to employee stock purchase plan 206     206      
Cash dividends declared (7,100)       (7,100)    
Ending balance (in shares) at Sep. 30, 2020     32,228,636,000        
Ending balance at Sep. 30, 2020 $ 1,223,402   $ 320 442,592 766,219   14,271
Beginning balance (in shares) at Dec. 31, 2020 31,779,663   31,779,663,000        
Beginning balance at Dec. 31, 2020 $ 1,240,892   $ 315 427,016 798,061   15,500
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net Income 135,071       135,071    
Other comprehensive loss, net of tax (17,816)           (17,816)
Stock-based compensation expense 5,814     5,814      
Vesting of time based stock awards issued at date of grant, net of shares withheld for payroll taxes (in shares)     (23,755,000)        
Vesting of time based stock awards issued at date of grant, net of shares withheld for payroll taxes 0   $ 1 (1)      
Vesting of performance based stock awards, net of shares withheld for payroll taxes (in shares)     15,686,000        
Time based stock awards granted (in shares)     179,172,000        
Issuance of common stock related to employee stock purchase plan (in shares)     9,767,000        
Issuance of common stock related to employee stock purchase plan 327     327      
Cash dividends declared (31,914)       (31,914)    
Common stock repurchased (in shares)     (13,075,000)        
Common stock repurchased $ (677)   $ 0 (677)      
Ending balance (in shares) at Sep. 30, 2021 31,947,458   31,947,458,000        
Ending balance at Sep. 30, 2021 $ 1,331,697   $ 316 432,479 901,218   (2,316)
Beginning balance (in shares) at Jun. 30, 2021     31,961,573,000        
Beginning balance at Jun. 30, 2021 1,306,336   $ 316 431,103 870,397   4,520
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net Income 43,609       43,609    
Other comprehensive loss, net of tax (6,836)           (6,836)
Stock-based compensation expense 1,990     1,990      
Vesting of time based stock awards issued at date of grant, net of shares withheld for payroll taxes (in shares)     (2,756,000)        
Time based stock awards granted (in shares)     250,000        
Cash dividends declared (12,788)       (12,788)    
Common stock repurchased (in shares)     (11,609,000)        
Common stock repurchased $ (615)     (615)      
Ending balance (in shares) at Sep. 30, 2021 31,947,458   31,947,458,000        
Ending balance at Sep. 30, 2021 $ 1,331,697   $ 316 $ 432,479 $ 901,218   $ (2,316)