Consolidated Statements of Changes in Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Class A
Common Stock
Class B
Common Stock
Pre-IPO
Treasury Stock
Class A
Treasury Stock
Class B
Treasury Stock
Pre-IPO
Additional Paid-In Capital
Accumulated Other Comprehensive Income (Loss)
Retained Deficit
Balance at beginning of period at Dec. 31, 2016 $ 330,998     $ 565     $ (16,245) $ 421,747 $ (537) $ (74,532)
Balance at beginning of period (in shares) at Dec. 31, 2016       56,505     (1,720)      
Increase (Decrease) in Stockholders' Equity                    
Issuance of common stock 3,193     $ 3       3,190    
Issuance of common stock (in shares)       296            
Vesting of restricted share grants       $ 4       (4)    
Vesting of restricted share grants (in shares)       389     (344)      
Common stock repurchased (4,654)           $ (4,654)      
Equity awards modified to liabilities (1,553)             (1,553)    
Equity awards modified to liabilities (in shares)       (8)            
Other comprehensive income (loss) 601               601  
Share-based compensation 11,693             11,693    
Dividends paid (135,171)                 (135,171)
Excess tax benefits realized on share-based compensation 261             261    
Other (11)                 (11)
Net income 25,826                 25,826
Balance at end of period at Dec. 31, 2017 231,183     $ 572     $ (20,899) 435,334 64 (183,888)
Balance at end of period (in shares) at Dec. 31, 2017       57,182     (2,064)      
Increase (Decrease) in Stockholders' Equity                    
Issuance of common stock 156,549 $ 128           156,421    
Issuance of common stock (in shares)   12,811                
Class A common stock offering costs (4,553)             (4,553)    
Redesignation of common stock     $ 572 $ (572)   $ (20,899) $ 20,899      
Redesignation of common stock, (in shares)     57,185 (57,184)   (2,064) 2,064      
Share conversion - Class B to A   $ 25 $ (25)              
Share conversion - Class B to A (in shares)   2,467 (2,467)              
Repurchase of shares (8,045)       $ (8,045)          
Repurchase of shares         (856) (83)        
Shares withheld related to net settlement of equity awards (820)         $ (820)        
Vesting of restricted share grants     $ 2         (2)    
Vesting of restricted share grants (in shares)     215 2            
Exercise of options 1,252   $ 4         1,248    
Exercise of options (in shares)     351              
Shares issued under 2018 ESPP 26             26    
Shares issued under 2018 ESPP (in shares)   3                
Fractional shares retired (2)             (2)    
Cumulative effect adjustment for adoption of ASU 2016-09, 2016-01 and 2018-02 1,818             512   1,306
Other comprehensive income (loss) (150)               (150)  
Share-based compensation 15,417             15,417    
Dividends paid (831)                 (831)
Net income 63,704                 63,704
Balance at end of period at Dec. 31, 2018 455,548 $ 153 $ 553   $ (8,045) $ (21,719)   604,401 (86) (119,709)
Balance at end of period (in shares) at Dec. 31, 2018   15,281 55,284   (856) (2,147)        
Increase (Decrease) in Stockholders' Equity                    
Issuance of common stock 62             62    
Issuance of common stock (in shares)   4                
Share conversion - Class B to A   $ 28 $ (28)              
Share conversion - Class B to A (in shares)   2,815 (2,815)              
Repurchase of shares (13,479)       $ (13,479)          
Repurchase of shares         (829)          
Shares withheld related to net settlement of equity awards (9,667)         $ (9,667)        
Shares withheld related to net settlement of equity awards (in shares)           (509)        
Vesting of restricted share grants     $ 4         (4)    
Vesting of restricted share grants (in shares)     522              
Exercise of options 4,014   $ 10         4,004    
Exercise of options (in shares)     946              
Cumulative effect adjustment for adoption of ASU 2016-09, 2016-01 and 2018-02                 62 (62)
Other comprehensive income (loss) 24               $ 24  
Share-based compensation 16,303             16,303    
Dividends paid (7,425)                 (7,425)
Net income 92,491                 92,491
Balance at end of period at Dec. 31, 2019 $ 537,871 $ 181 $ 539   $ (21,524) $ (31,386)   $ 624,766   $ (34,705)
Balance at end of period (in shares) at Dec. 31, 2019   18,100 53,937   (1,685) (2,656)