Consolidated Statements of Stockholders' Equity (Deficit) - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Treasury Stock	Additional Paid-in Capital	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Loss	Class A Common Common Stock	Class B Common Common Stock
Consolidated Statements of Stockholders' Equity (Deficit)
Adjustment to retained earnings for adoption of ASC 326	$ 642,772		$ (199,817)	$ 534,159	$ 308,905		$ (476)	$ 0	$ 1
Balance (in shares) at Dec. 31, 2017			(14,620,175)					77,588,018	80,957,495
Balance at Dec. 31, 2017	642,772		$ (199,817)	534,159	308,905		(476)	$ 0	$ 1
Consolidated Statements of Stockholders' Equity (Deficit)
Stock-based compensation expense	16,044			16,044
Issuance of common stock related to business combination (in shares)								7,598,731
Issuance of common stock related to business combination	70,000			70,000
Exercise of stock options (in shares)								258,921
Stock Issued During Period, Value, Stock Options Exercised	1,834			1,834
Conversion Class B to Class A common stock (in shares)								348,810	(348,810)
Issuance of shares related to restricted stock units and awards (in shares)								1,168,541
Shares withheld for employee taxes upon conversion of restricted stock (in shares)								(283,446)
Shares withheld for employee taxes upon conversion of restricted stock	(3,363)			(3,363)
Other comprehensive loss	(6,264)						(6,264)
Adjustment to retained earnings for adoption of ASU 2018-02	(102)
Adjustment to retained earnings for adoption of ASU 2018-02 | ASU 2018-02		$ 102				$ 102
Adjustment to retained earnings for adoption of ASC 326	682,589		$ (199,817)	618,674	270,471		(6,740)	$ 0	$ 1
Adjustment to retained earnings for adoption of ASC 326 | ASC 606		628				628
Net income (loss)	(39,164)				(39,164)
Balance (in shares) at Dec. 31, 2018			(14,620,175)					86,679,575	80,608,685
Balance at Dec. 31, 2018	682,589		$ (199,817)	618,674	270,471		(6,740)	$ 0	$ 1
Balance (ASC 606) at Dec. 31, 2018		628				628
Consolidated Statements of Stockholders' Equity (Deficit)
Adjustment to retained earnings for adoption of ASC 326	682,589		(199,817)	618,674	270,471		(6,740)	$ 0	$ 1
Adjustment to retained earnings for adoption of ASC 326 | ASC 606		628				628
Stock-based compensation expense	19,996			19,996
Exercise of stock options (in shares)								403,643	139,270
Stock Issued During Period, Value, Stock Options Exercised	3,669			3,669
Conversion Class B to Class A common stock (in shares)								1,378,544	(1,378,544)
Conversion Class B to Class A common stock								$ 1	$ (1)
Issuance of shares related to restricted stock units and awards (in shares)								2,286,379
Shares withheld for employee taxes upon conversion of restricted stock (in shares)								(420,413)
Shares withheld for employee taxes upon conversion of restricted stock	(5,878)			(5,878)
Other comprehensive loss	(19,992)						(19,992)
Adjustment to retained earnings for adoption of ASU 2018-02	0
Adjustment to retained earnings for adoption of ASC 326	682,589	65	$ (199,817)	636,461	278,246	65	(26,732)	$ 1	$ 0
Adjustment to retained earnings for adoption of ASC 326 | ASC 606		628				628
Net income (loss)	7,775				7,775
Balance (in shares) at Dec. 31, 2019			(14,620,175)					90,327,728	79,369,411
Balance at Dec. 31, 2019	688,159	65	$ (199,817)	636,461	278,246	65	(26,732)	$ 1	$ 0
Consolidated Statements of Stockholders' Equity (Deficit)
Adjustment to retained earnings for adoption of ASC 326	688,159	65	(199,817)	636,461	278,246	65	(26,732)	$ 1	$ 0
Stock-based compensation expense	30,142			30,142
Exercise of stock options (in shares)								25,287	0
Stock Issued During Period, Value, Stock Options Exercised	198			198
Conversion Class B to Class A common stock (in shares)								1,037,820	(1,037,820)
Conversion Class B to Class A common stock								$ 0	$ 0
Issuance of shares related to restricted stock units and awards (in shares)								806,403
Shares withheld for employee taxes upon conversion of restricted stock (in shares)								(579,788)
Shares withheld for employee taxes upon conversion of restricted stock	(11,357)			(11,357)
Other comprehensive loss	(21,072)						(21,072)
Adjustment to retained earnings for adoption of ASU 2018-02	0
Adjustment to retained earnings for adoption of ASC 326	$ 688,159	$ 65	$ (199,817)	655,444	300,890	$ 65	(47,804)	$ 1	$ 0
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Net income (loss)	$ 22,579				22,579
Balance (in shares) at Dec. 31, 2020			(14,620,175)					91,617,450	78,331,591
Balance at Dec. 31, 2020	708,714		$ (199,817)	655,444	300,890		(47,804)	$ 1	$ 0
Consolidated Statements of Stockholders' Equity (Deficit)
Adjustment to retained earnings for adoption of ASC 326	$ 708,714		$ (199,817)	$ 655,444	$ 300,890		$ (47,804)	$ 1	$ 0