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Consolidated Statements of Shareholders' Equity - USD ($)
Total
Common Stock
Deferred Equity Compensation
Retained Earnings
Beginning Balance, shares at Dec. 31, 2014   3,317,728    
Beginning Balance at Dec. 31, 2014 $ 74,319,224 $ 84,855,693 $ (12,566,133) $ 2,029,664
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, shares   27,192    
Issuance of stock grants 3,826,458 $ 3,826,458    
Issuance of common stock related to 401k plan match 1,645,434 $ 1,645,434    
Issuance of common stock related to 401k plan match (in 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 $5.00 in 2015, $6.00 in 2016, and $7.00 in 2017 per share respectively (17,031,890)     (17,031,890)
Net income attributable to parent 37,074,497     37,074,497
Ending Balance, shares at Dec. 31, 2015   3,414,338    
Ending Balance at Dec. 31, 2015 105,314,014 $ 102,536,527 (19,294,784) 22,072,271
Beginning balances attributable to redeemable noncontrolling interests at Dec. 31, 2014 0      
Ending balances attributable to redeemable noncontrolling interests at Dec. 31, 2015 0      
Increase (Decrease) in Temporary Equity [Roll Forward]        
Cumulative-effect adjustment from the adoption of ASU 2015-02 (Note 2) 4,031,756      
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, shares   21,940    
Issuance of stock grants 3,879,431 $ 3,879,431    
Issuance of common stock related to 401k plan match 1,738,287 $ 1,738,287    
Issuance of common stock related to 401k plan match (in 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 $5.00 in 2015, $6.00 in 2016, and $7.00 in 2017 per share respectively (20,465,736)     (20,465,736)
Net income attributable to parent $ 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]        
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      
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Issuance of restricted stock grants 0 $ 8,454,411 (8,454,411)  
Issuance of restricted stock grants, shares   57,350    
Amortization of restricted stock grants 6,871,284   6,871,284  
Issuance of stock grants, shares   19,219    
Issuance of stock grants 3,892,424 $ 3,892,424    
Issuance of common stock related to 401k plan match 1,710,785 $ 1,710,785    
Issuance of common stock related to 401k plan match (in shares)   8,478    
Shares withheld related to employee tax withholding (4,966,042) $ (4,966,042)    
Shares withheld related to employee tax withholding (shares)   (24,425)    
Forfeiture of restricted stock grants 0 $ (176,270) 176,270  
Forfeiture of restricted stock grants, shares   (1,750)    
Cash dividend paid of $5.00 in 2015, $6.00 in 2016, and $7.00 in 2017 per share respectively (24,277,743)     (24,277,743)
Net income attributable to parent $ 49,988,957     49,988,957
Ending Balance, shares at Dec. 31, 2017 3,470,428 3,470,428    
Ending Balance at Dec. 31, 2017 $ 172,443,820 $ 118,209,111 $ (19,134,963) $ 73,369,672
Increase (Decrease) in Temporary Equity [Roll Forward]        
Net Income Attributable to Redeemable Noncontrolling Interest 1,612,712      
Net subscriptions of consolidated funds 4,623,406      
Ending balances attributable to redeemable noncontrolling interests at Dec. 31, 2017 $ 20,076,806