CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($) $ in Thousands	Total	Common Stock Class A Common	Common Stock Class B Common	Treasury Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive (Loss) Income
Beginning balance (in shares) at Dec. 31, 2018		86,679,575	80,608,685	(14,620,175)
Beginning balance at Dec. 31, 2018	$ 682,589	$ 0	$ 1	$ (199,817)	$ 618,674	$ 270,471	$ (6,740)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	5,163				5,163
Conversion Class B to Class A common stock (in shares)		460,000	(460,000)
Issuance of shares related to restricted stock units and awards, net of forfeitures (in shares)		759,409
Shares withheld for employee taxes upon conversion of restricted stock (in shares)		(82,978)
Shares withheld for employee taxes upon conversion of restricted stock	(1,086)				(1,086)
Other comprehensive loss	(8,054)						(8,054)
Net loss	(8,323)					(8,323)
Ending balance (in shares) at Mar. 31, 2019		87,816,006	80,148,685	(14,620,175)
Ending balance at Mar. 31, 2019	670,289	$ 0	$ 1	$ (199,817)	622,751	262,148	(14,794)
Beginning balance (in shares) at Dec. 31, 2019		90,327,728	79,369,411	(14,620,175)
Beginning balance at Dec. 31, 2019	688,159	$ 1	$ 0	$ (199,817)	636,461	278,246	(26,732)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	7,164				7,164
Exercise of stock options (in shares)		23,183
Exercise of stock options	183				183
Conversion Class B to Class A common stock (in shares)		98,550	(98,550)
Issuance of shares related to restricted stock units and awards, net of forfeitures (in shares)		574,082
Shares withheld for employee taxes upon conversion of restricted stock (in shares)		(148,071)
Shares withheld for employee taxes upon conversion of restricted stock	(2,947)				(2,947)
Other comprehensive loss	(24,200)						(24,200)
Net loss	(1,683)					(1,683)
Ending balance (in shares) at Mar. 31, 2020		90,875,472	79,270,861	(14,620,175)
Ending balance at Mar. 31, 2020	$ 666,741	$ 1	$ 0	$ (199,817)	$ 640,861	$ 276,628	$ (50,932)