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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($)
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
Accumulated (Deficit) Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Noncontrolling Interests
Total
Beginning balance at Dec. 31, 2017     $ 592,000   $ 67,000   $ 404,000       $ 656,647,000 $ 673,141,000 $ (17,859,000) $ 302,000 $ 406,722,000 $ 1,063,369,000
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 $ 67,000     $ (67,000)                        
Conversion of common stock (in shares) 6,731,839     (6,731,839)                        
Exchange of shares of Class B common stock and SES Holdings, LLC units for shares of Class A common stock   $ 144,000       $ (144,000)   $ 146,865,000 $ 146,865,000 $ (146,865,000)            
Exchange of shares of Class B common stock and SES Holdings, LLC common units for shares of Class A common stock (in shares)   14,305,146       (14,305,146)                    
ESPP shares issued                     132,000 132,000     (15,000) 117,000
ESPP shares issued (in shares)     9,793                          
Equity-based compensation                     7,312,000 7,312,000     3,059,000 10,371,000
Issuance of restricted shares     $ 4,000               2,325,000 2,321,000     (2,325,000)  
Issuance of restricted shares (in shares)     438,182                          
Exercise of restricted stock units                     104,000 104,000     (104,000)  
Exercise of restricted stock units (in shares)     27,860                          
Stock options exercised     $ 1,000               1,019,000 1,018,000     (374,000) 645,000
Stock options exercised (in shares)     79,333                          
Repurchase of common stock     $ (17,000)               (17,138,000) (17,121,000)     576,000 (16,562,000)
Repurchase of common stock ( in shares)     (1,766,428)   (6)                      
Restricted shares forfeited     $ (1,000)               (383,000) (382,000)     383,000  
Restricted shares forfeited (in shares)     (51,346)                          
Distributions to noncontrolling interests, net                             (506,000) (506,000)
NCI income tax adjustment                     209,000 209,000     (209,000)  
Foreign currency translation adjustment                     (670,000)     (670,000) (290,000) (960,000)
Net (loss) income                     36,512,000   36,512,000   17,787,000 54,299,000
Ending balance at Dec. 31, 2018     $ 790,000       $ 260,000       832,934,000 813,599,000 18,653,000 (368,000) 277,839,000 1,110,773,000
Ending balance (in shares) at Dec. 31, 2018     78,956,555       26,026,843                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                
Exchange of shares of Class B common stock and SES Holdings, LLC units for shares of Class A common stock   $ 98,000       $ (98,000)   $ 107,062,000 $ 107,062,000 $ (107,062,000)            
Exchange of shares of Class B common stock and SES Holdings, LLC common units for shares of Class A common stock (in shares)   9,805,742       (9,805,742)                    
ESPP shares issued                     154,000 154,000     (42,000) 112,000
ESPP shares issued (in shares)     13,178                          
Equity-based compensation                     12,050,000 12,050,000     3,435,000 15,485,000
Issuance of restricted shares     $ 14,000               3,653,000 3,639,000     (3,653,000)  
Issuance of restricted shares (in shares)     1,417,458                          
Exercise of restricted stock units                     4,000 4,000     (4,000)  
Exercise of restricted stock units (in shares)     1,250                          
Stock options exercised                     84,000 84,000     (54,000) 30,000
Stock options exercised (in shares)     5,282                          
Repurchase of common stock     $ (23,000)               (21,962,000) (21,939,000)     3,362,000 (18,600,000)
Repurchase of common stock ( in shares)     (2,288,880)                          
Restricted shares forfeited                     (39,000) (39,000)     39,000  
Restricted shares forfeited (in shares)     (17,060)                          
Distributions to noncontrolling interests, net                             (404,000) (404,000)
NCI income tax adjustment                     66,000 66,000     (66,000)  
Foreign currency translation adjustment                     387,000 19,000   $ 368,000 85,000 472,000
Net (loss) income                     2,784,000   2,784,000   1,352,000 4,136,000
Ending balance at Dec. 31, 2019     $ 879,000       $ 162,000       937,177,000 914,699,000 21,437,000   175,635,000 1,112,812,000
Ending balance (in shares) at Dec. 31, 2019     87,893,525       16,221,101                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                
ESPP shares issued     $ 15,132               83,000 83,000     (7,000) 76,000
Equity-based compensation                     4,856,000 4,856,000     908,000 5,764,000
Issuance of restricted shares     $ 15,000               2,422,000 2,407,000     (2,422,000)  
Issuance of restricted shares (in shares)     1,477,488                          
Exercise of restricted stock units                     1,000 1,000     (1,000)  
Exercise of restricted stock units (in shares)     625                          
Repurchase of common stock     $ (22,000)               (12,292,000) (12,270,000)     1,416,000 (10,876,000)
Repurchase of common stock ( in shares)     (2,199,824)                          
Restricted shares forfeited     $ (4,000)               (548,000) (544,000)     548,000  
Restricted shares forfeited (in shares)     (374,299)                          
Distributions to noncontrolling interests, net                             (162,000) (162,000)
NCI income tax adjustment                     46,000 46,000     (46,000)  
Net (loss) income                     (338,684,000)   (338,684,000)   (63,048,000) (401,732,000)
Ending balance at Dec. 31, 2020     $ 868,000       $ 162,000       $ 593,061,000 $ 909,278,000 $ (317,247,000)   $ 112,821,000 $ 705,882,000
Ending balance (in shares) at Dec. 31, 2020     86,812,647       16,221,101