General form of registration statement for all companies including face-amount certificate companies

Stock-based and Long-Term Compensation - Schedule of Unvested Restricted Stock Awards and Restricted Stock Units (Details)

v3.19.3.a.u2
Stock-based and Long-Term Compensation - Schedule of Unvested Restricted Stock Awards and Restricted Stock Units (Details) - Common Class A
12 Months Ended
Dec. 31, 2018
$ / shares
shares
Restricted Stock  
Series A Restricted Stock Awards or Units  
Outstanding, Beginning of Period (in shares) | shares 35,473
Granted (in shares) | shares 0
Vested (in shares) | shares (20,450)
Canceled (in shares) | shares 0
Outstanding, Ending in Period (in shares) | shares 15,023
WAFV  
Outstanding, Beginning of Period (in dollars per share) | $ / shares $ 19.13
Granted (in dollars per share) | $ / shares 0.00
Vested (in dollars per share) | $ / shares 22.02
Canceled (in dollars per share) | $ / shares 0.00
Outstanding, Ending of Period (in dollars per share) | $ / shares $ 15.20
Restricted Stock Units (RSUs)  
Series A Restricted Stock Awards or Units  
Outstanding, Beginning of Period (in shares) | shares 223,177
Granted (in shares) | shares 407,609
Vested (in shares) | shares (70,834)
Canceled (in shares) | shares (72,463)
Outstanding, Ending in Period (in shares) | shares 487,489
WAFV  
Outstanding, Beginning of Period (in dollars per share) | $ / shares $ 17.93
Granted (in dollars per share) | $ / shares 3.68
Vested (in dollars per share) | $ / shares 25.60
Canceled (in dollars per share) | $ / shares 13.80
Outstanding, Ending of Period (in dollars per share) | $ / shares $ 5.52