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Consolidated Statements of Stockholders' Equity (Statement) - USD ($)
$ in Thousands
Total
Cumulative Effect, Period of Adoption, Adjustment
Private Placement
Follow-On Offering
Common Stock
Common Stock
Private Placement
Common Stock
Follow-On Offering
Additional paid-in capital
Additional paid-in capital
Private Placement
Additional paid-in capital
Follow-On Offering
Accumulated other comprehensive loss
Accumulated deficit
Accumulated deficit
Cumulative Effect, Period of Adoption, Adjustment
Accumulated deficit
Private Placement
Beginning balance (in shares) at Dec. 31, 2017         247,465,176                  
Beginning balance at Dec. 31, 2017 $ 52,167       $ 2,474     $ 377,809     $ (18,540) $ (309,576)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                            
Net income 142,112                     142,112    
Other comprehensive loss (10,874)                   (10,874)      
Dividends declared (20,005)                     (20,005)    
Profit-sharing plan shares, net (in shares)         (465,979)                  
Profit‑sharing plan shares, net (3,387)       $ (5)             (3,382)    
Shares issued in connection with deferred compensation plan, net (in shares)         2,332,585                  
Shares issued in connection with deferred compensation plan, net (6,861)       $ 23             (6,884)    
Deferred compensation plan voluntary contributions and vesting of awards 4,504             4,504            
Payment of shareholder Put and Call rights (in shares)         (1,131,928)                  
Payment of shareholder Put and Call rights (8,571)       $ (11)             (8,560)    
Common Stock Purchase Agreement, net and Class B Common Stock follow-on offering net of expenses of $12,898 (in shares)           (1,281,633)                
Common Stock Purchase Agreement, net and Class B Common Stock follow-on offering net of expenses of $12,898     $ (9,673)     $ (13)     $ 13         $ (9,673)
Stock option exercises, net (in shares)         2,812,998                  
Stock option exercises, net 610       $ 28     2,151       (1,569)    
Stock-based compensation expense 7,882             7,882            
Shares related to restricted stock, net (in shares)         546,783                  
Shares related to restricted stock, net (137)       $ 6     494       (637)    
Other (in shares)         5,511                  
Other 43             43            
Cumulative effect adjustment on deferred tax expense (379)                     (379)    
Ending balance (in shares) at Dec. 31, 2018         250,283,513                  
Ending balance at Dec. 31, 2018 147,431 $ 107,822     $ 2,502     392,896     (29,414) (218,553) $ 107,822  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                            
Net income 103,096                     103,096    
Other comprehensive loss 5,487                   5,487      
Dividends declared (25,390)                     (25,390)    
Profit-sharing plan shares, net (in shares)         (318,203)                  
Profit‑sharing plan shares, net (2,417)       $ (3)             (2,414)    
Shares issued in connection with deferred compensation plan, net (in shares)         2,322,983                  
Shares issued in connection with deferred compensation plan, net (5,609)       $ 23             (5,632)    
Deferred compensation plan voluntary contributions and vesting of awards 3,586             3,586            
Payment of shareholder Put and Call rights (in shares)         (1,126,747)                  
Payment of shareholder Put and Call rights (8,838)       $ (11)             (8,827)    
Common Stock Purchase Agreement, net and Class B Common Stock follow-on offering net of expenses of $12,898 (in shares)           64,509                
Common Stock Purchase Agreement, net and Class B Common Stock follow-on offering net of expenses of $12,898     418           $ 466         (48)
Stock option exercises, net (in shares)         3,214,542                  
Stock option exercises, net 1,303       $ 33     3,579       (2,309)    
Stock-based compensation expense 8,091             8,091            
Shares related to restricted stock, net (in shares)         395,336                  
Shares related to restricted stock, net (399)       $ 4     (4)       (399)    
Other (in shares)         7,016                  
Other 38             53       (15)    
Ending balance (in shares) at Dec. 31, 2019         254,842,949                  
Ending balance at Dec. 31, 2019 334,619       $ 2,548     408,667     (23,927) (52,669)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                            
Net income 126,521                     126,521    
Other comprehensive loss (2,306)                   (2,306)      
Dividends declared (424,018)                     (424,018)    
Profit-sharing plan shares, net (in shares)         (549,834)                  
Profit‑sharing plan shares, net (6,970)       $ (5)             (6,965)    
Shares issued in connection with deferred compensation plan, net (in shares)         3,081,607                  
Shares issued in connection with deferred compensation plan, net (4,625)       $ 31             (4,656)    
Deferred compensation plan voluntary contributions and vesting of awards 3,530             3,530            
Payment of shareholder Put and Call rights (in shares)         (128,007)                  
Payment of shareholder Put and Call rights (1,454)       $ (1)             (1,453)    
Common Stock Purchase Agreement, net and Class B Common Stock follow-on offering net of expenses of $12,898 (in shares)           0 9,603,965              
Common Stock Purchase Agreement, net and Class B Common Stock follow-on offering net of expenses of $12,898     $ (57) $ 294,429     $ 96     $ 294,333       $ (57)
Stock option exercises, net (in shares)         4,060,839                  
Stock option exercises, net 4,356       $ 41     9,070       (4,755)    
Shares issued for stock grants, net (in shares)         21,956                  
Shares issued for stock grants, net 319             319            
Stock-based compensation expense 25,194             25,194            
Shares related to restricted stock, net (in shares)         1,221,029                  
Shares related to restricted stock, net (7,939)       $ 12             (7,951)    
Ending balance (in shares) at Dec. 31, 2020         272,154,504                  
Ending balance at Dec. 31, 2020 $ 341,599       $ 2,722     $ 741,113     $ (26,233) $ (376,003)