CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Accounts receivable, allowance for credit loss	$ 1,088	$ 1,143
Accumulated depreciation, depletion and amortization, property, plant, and equipment	14,354	14,159
Finite-lived intangible assets, accumulated amortization	$ 105,168	$ 95,632
Common stock, par or stated value per share (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	36,884,000	36,610,000
Treasury stock, common shares (in shares)	7,055,000	7,055,000