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Consolidated Statements of Shareholders' Equity - USD ($)
Total
Common Stock
Deferred Equity Compensation
Retained Earnings/(Deficit)
Beginning Balance, shares at Dec. 31, 2013   3,257,247    
Beginning Balance at Dec. 31, 2013 $ 44,942,990 $ 72,642,933 $ (11,397,560) $ (16,302,383)
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Issuance of restricted stock grants 0 $ 7,518,895 (7,518,895)  
Issuance of restricted stock grants, shares   31,613    
Amortization of restricted stock grants 5,716,035   5,716,035  
Issuance of stock grants 3,984,816 $ 3,984,816    
Issuance of stock grants, shares   33,745    
Issuance of common stock related to 401k plan match 1,356,035 $ 1,356,035    
Issuance of common stock related to 401k plan match, shares   10,999    
Tax benefit from dividend payments related to restricted stock grants 296,755 $ 296,755    
Net excess tax benefit from vested restricted stock grants 666,889 666,889    
Shares withheld related to employee tax withholding (976,343) $ (976,343)    
Shares withheld related to employee tax withholding (shares)   (7,663)    
Forfeiture of restricted stock grants 0 $ (634,287) 634,287  
Forfeiture of restricted stock grants, shares   (8,213)    
Cash dividend paid of $4.00 in 2014, $5.00 in 2015, and $6.00 in 2016 per share respectively (13,248,884)     (13,248,884)
Net income 31,580,931     31,580,931
Ending Balance, shares at Dec. 31, 2014   3,317,728    
Ending Balance at Dec. 31, 2014 74,319,224 $ 84,855,693 (12,566,133) 2,029,664
Beginning balances attributable to redeemable noncontrolling interests at Dec. 31, 2013 0      
Increase (Decrease) in Temporary Equity [Roll Forward]        
Cumulative-effect adjustment from the adoption of ASU 2015-02 (Note 2) 0      
Ending balances attributable to redeemable noncontrolling interests at Dec. 31, 2014 0      
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Issuance of restricted stock grants 0 $ 13,907,286 (13,907,286)  
Issuance of restricted stock grants, shares   92,050    
Amortization of restricted stock grants 6,906,300   6,906,300  
Issuance of stock grants 3,826,458 $ 3,826,458    
Issuance of stock grants, shares   27,192    
Issuance of common stock related to 401k plan match 1,645,434 $ 1,645,434    
Issuance of common stock related to 401k plan match, shares   9,336    
Tax benefit from dividend payments related to restricted stock grants 376,394 $ 376,394    
Net excess tax benefit from vested restricted stock grants 2,521,273 2,521,273    
Shares withheld related to employee tax withholding (4,323,676) $ (4,323,676)    
Shares withheld related to employee tax withholding (shares)   (28,468)    
Forfeiture of restricted stock grants 0 $ (272,335) 272,335  
Forfeiture of restricted stock grants, shares   (3,500)    
Cash dividend paid of $4.00 in 2014, $5.00 in 2015, and $6.00 in 2016 per share respectively (17,031,890)     (17,031,890)
Net income $ 37,074,497     37,074,497
Ending Balance, shares at Dec. 31, 2015 3,414,338 3,414,338    
Ending Balance at Dec. 31, 2015 $ 105,314,014 $ 102,536,527 (19,294,784) 22,072,271
Increase (Decrease) in Temporary Equity [Roll Forward]        
Cumulative-effect adjustment from the adoption of ASU 2015-02 (Note 2) 0      
Ending balances attributable to redeemable noncontrolling interests at Dec. 31, 2015 0      
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Issuance of restricted stock grants 0 $ 7,504,564 (7,504,564)  
Issuance of restricted stock grants, shares   35,900    
Amortization of restricted stock grants 6,466,797   6,466,797  
Issuance of stock grants 3,879,431 $ 3,879,431    
Issuance of stock grants, shares   21,940    
Issuance of common stock related to 401k plan match 1,738,287 $ 1,738,287    
Issuance of common stock related to 401k plan match, shares   9,466    
Tax benefit from dividend payments related to restricted stock grants 1,372,996 $ 1,372,996    
Net excess tax benefit from vested restricted stock grants 4,895,907 4,895,907    
Shares withheld related to employee tax withholding (10,029,464) $ (10,029,464)    
Shares withheld related to employee tax withholding (shares)   (53,018)    
Forfeiture of restricted stock grants 0 $ (2,604,445) 2,604,445  
Forfeiture of restricted stock grants, shares   (17,070)    
Cash dividend paid of $4.00 in 2014, $5.00 in 2015, and $6.00 in 2016 per share respectively (20,465,736)     (20,465,736)
Net income $ 46,051,923     46,051,923
Ending Balance, shares at Dec. 31, 2016 3,411,556 3,411,556    
Ending Balance at Dec. 31, 2016 $ 139,224,155 $ 109,293,803 $ (17,728,106) $ 47,658,458
Increase (Decrease) in Temporary Equity [Roll Forward]        
Cumulative-effect adjustment from the adoption of ASU 2015-02 (Note 2) 4,031,756      
Net Income Attributable to Redeemable Noncontrolling Interest 542,209      
Net subscriptions of consolidated funds 9,266,723      
Ending balances attributable to redeemable noncontrolling interests at Dec. 31, 2016 $ 13,840,688