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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($)
$ in Thousands
Class A Common Stock
Conversion of Class A-2 to Class A
Class A Common Stock
Conversion of Class B to Class A
Class A Common Stock
Class A-2 Common Stock
Conversion of Class A-2 to Class A
Class A-2 Common Stock
Class B Common Stock
Conversion of Class B to Class A
Class B Common Stock
Conversion of Class B to Class A
Total Stockholders' Equity
Conversion of Class B to Class A
Additional Paid-In Capital
Conversion of Class B to Class A
Noncontrolling Interests
Total Stockholders' Equity
Additional Paid-In Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Noncontrolling Interests
Total
Beginning balance at Dec. 31, 2017     $ 592   $ 67   $ 404       $ 656,647 $ 673,141 $ (17,859) $ 302 $ 406,722 $ 1,063,369
Beginning balance (in shares) at Dec. 31, 2017     59,182,176   6,731,845   40,331,989                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                
Conversion of common stock $ 67 $ 110   $ (67)   $ (110)   $ 111,803 $ 111,803 $ (111,803)            
Conversion of common stock (in shares) 6,731,839 10,948,669   (6,731,839)   (10,948,669)                    
ESPP shares issued                     50 50     4 54
ESPP shares issued (in shares)     3,986                          
Equity-based compensation                     3,617 3,617     1,848 5,465
Issuance of restricted shares     $ 4               2,265 2,261     (2,265)  
Issuance of restricted shares (in shares)     430,595                          
Exercise of restricted stock units                     104 104     (104)  
Exercise of restricted stock units (in shares)     27,860                          
Stock options exercised                     376 376     1 377
Stock options exercised (in shares)     37,209                          
Repurchase of common stock                     (583) (583)     (74) (657)
Repurchase of common stock ( in shares)     (45,034)   (6)                      
Restricted shares forfeited                     (70) (70)     70  
Restricted shares forfeited (in shares)     (18,640)                          
Noncontrolling interest in subsidiary                             (280) (280)
Foreign currency translation adjustment, net of tax of $0                     (450)     (450) (221) (671)
Net income                     27,062   27,062   14,093 41,155
Ending balance at Jun. 30, 2018     $ 773       $ 294       800,821 790,699 9,203 (148) 307,991 1,108,812
Ending balance (in shares) at Jun. 30, 2018     77,298,660       29,383,320                  
Beginning balance at Mar. 31, 2018     $ 662       $ 404       669,244 675,895 (7,760) 43 412,026 1,081,270
Beginning balance (in shares) at Mar. 31, 2018     66,258,163       40,331,989                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                
Conversion of common stock     $ 110       $ (110)       111,803 111,803     (111,803)  
Conversion of common stock (in shares)     10,948,669       (10,948,669)                  
ESPP shares issued                     50 50     4 54
ESPP shares issued (in shares)     3,986                          
Equity-based compensation                     2,075 2,075     909 2,984
Issuance of restricted shares     $ 1               841 840     (841)  
Issuance of restricted shares (in shares)     99,206                          
Exercise of restricted stock units                     102 102     (102)  
Exercise of restricted stock units (in shares)     625                          
Stock options exercised                     295 295     (48) 247
Stock options exercised (in shares)     17,811                          
Repurchase of common stock                     (361) (361)     (32) (393)
Repurchase of common stock ( in shares)     (29,800)                          
Noncontrolling interest in subsidiary                             (119) (119)
Foreign currency translation adjustment, net of tax of $0                     (191)     (191) (63) (254)
Net income                     16,963   16,963   8,060 25,023
Ending balance at Jun. 30, 2018     $ 773       $ 294       800,821 790,699 9,203 (148) 307,991 1,108,812
Ending balance (in shares) at Jun. 30, 2018     77,298,660       29,383,320                  
Beginning balance at Dec. 31, 2018     $ 790       $ 260       832,934 813,599 18,653 (368) 277,839 1,110,773
Beginning balance (in shares) at Dec. 31, 2018     78,956,555       26,026,843                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                
ESPP shares issued                     58 58     (2) 56
ESPP shares issued (in shares)     5,667                          
Equity-based compensation                     6,271 6,271     2,037 8,308
Issuance of restricted shares     $ 14               3,563 3,549     (3,563)  
Issuance of restricted shares (in shares)     1,373,930                          
Exercise of restricted stock units                     4 4     (4)  
Exercise of restricted stock units (in shares)     1,250                          
Repurchase of common stock     $ (2)               (1,541) (1,539)     25 (1,516)
Repurchase of common stock ( in shares)     (152,502)                          
Restricted shares forfeited                     (23) (23)     23  
Restricted shares forfeited (in shares)     (8,822)                          
Distributions to noncontrolling interests, net                             (225) (225)
Noncontrolling interest in subsidiary                     49 49     (49)  
Foreign currency translation adjustment, net of tax of $0                     (12)     (12) (4) (16)
Net income                     7,335   7,335   2,133 9,468
Ending balance at Jun. 30, 2019     $ 802       $ 260       848,638 821,968 25,988 (380) 278,210 1,126,848
Ending balance (in shares) at Jun. 30, 2019     80,176,078       26,026,843                  
Beginning balance at Mar. 31, 2019     $ 800       $ 260       839,090 818,556 19,788 (314) 276,023 1,115,113
Beginning balance (in shares) at Mar. 31, 2019     79,998,292       26,026,843                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                
ESPP shares issued                     29 29       29
ESPP shares issued (in shares)     2,857                          
Equity-based compensation                     3,117 3,117     1,012 4,129
Issuance of restricted shares     $ 3               527 524     (527)  
Issuance of restricted shares (in shares)     204,153                          
Exercise of restricted stock units                     2 2     (2)  
Exercise of restricted stock units (in shares)     625                          
Repurchase of common stock     $ (1)               (296) (295)     (4) (300)
Repurchase of common stock ( in shares)     (26,716)                          
Restricted shares forfeited                     (8) (8)     8  
Restricted shares forfeited (in shares)     (3,133)                          
Distributions to noncontrolling interests, net                             (104) (104)
Noncontrolling interest in subsidiary                     43 43     (43)  
Foreign currency translation adjustment, net of tax of $0                     (66)     (66) (21) (87)
Net income                     6,200   6,200   1,868 8,068
Ending balance at Jun. 30, 2019     $ 802       $ 260       $ 848,638 $ 821,968 $ 25,988 $ (380) $ 278,210 $ 1,126,848
Ending balance (in shares) at Jun. 30, 2019     80,176,078       26,026,843