Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Accounts receivable, allowance for credit loss	$ 1,143	$ 885
Accumulated depreciation on property and equipment	14,159	11,844
Accumulated amortization on intangible assets	$ 95,632	$ 78,627
Common stock, par value (in usd per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	36,610,000	34,457,000
Treasury stock (in shares)	7,055,000	6,983,000