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Consolidated Statements of Changes in Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income [Member]
Noncontrolling Interest [Member]
Balance, value at Dec. 31, 2015 $ 383,783 $ 21 $ 79,231 $ 302,220 $ 2,311 $ 0
Balance, shares at Dec. 31, 2015   20,381,949        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 52,839     52,839    
Unrealized income on investment, net of tax effect 955       955  
Reclassification adjustment for gain realized on investment, net of tax effect of $1,198 (1,742)       (1,742)  
Share-based compensation 1,577   1,691 (114)    
Issuance of restricted and deferred stock units, value (161)   (161)      
Issuance of restricted and deferred stock units, shares   44,062        
Employee stock purchase plan, value $ 954   954      
Employee stock purchase plan, shares 30,214 30,214        
Dividends $ (16,559)     (16,559)    
Balance, value at Dec. 31, 2016 421,646 $ 21 81,715 338,386 1,524 0
Balance, shares at Dec. 31, 2016   20,456,225        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 61,100     59,204   1,896
Unrealized income on investment, net of tax effect 679       679  
Share-based compensation 2,504   2,643 (139)    
Distribution to noncontrolling interest (1,896)         (1,896)
Issuance of restricted and deferred stock units, value (707)   (707)      
Issuance of restricted and deferred stock units, shares   36,888        
Employee stock purchase plan, value $ 1,215   1,215      
Employee stock purchase plan, shares 27,743 27,743        
Dividends $ (21,332)     (21,332)    
Balance, value at Dec. 31, 2017 $ 463,209 $ 21 84,866 376,119 2,203 0
Balance, shares at Dec. 31, 2017 20,520,856 20,520,856        
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Cumulative effect of change in accounting principle, net of tax effect of $1,507 $ 0     2,203 (2,203)  
Net income 38,767     38,767    
Share-based compensation 2,020   2,117 (97)    
Issuance of restricted and deferred stock units, value (4,057)   (4,057)      
Issuance of restricted and deferred stock units, shares   95,053        
Employee stock purchase plan, value $ 1,371   1,371      
Employee stock purchase plan, shares 25,907 25,907        
Dividends $ (23,074)     (23,074)    
Common stock issued 411,076 $ 7 411,069      
Common stock issued, shares   7,762,500        
Balance, value at Dec. 31, 2018 $ 889,312 $ 28 $ 495,366 $ 393,918 $ 0 $ 0
Balance, shares at Dec. 31, 2018 28,404,316 28,404,316