Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred Tax Assets:
Accruals and allowances	$ 20,743	$ 20,765
Net operating loss carryforwards	1,267	1,673
Stock-based compensation	6,381	5,734
Deferred rent		1,296
Operating lease liability	6,456
Deferred revenue	1,449	1,100
Tax credit carryforwards	896	1,661
Acquired intangibles	31,708	31,902
Depreciation and amortization	1,639	866
Other	1,080
Total deferred tax assets	71,619	64,997
Deferred Tax Liabilities:
Right of use asset	(5,218)
Other	(1,053)	(706)
Total deferred tax liabilities	(6,271)	(706)
Valuation Allowance	(6,418)	(6,734)
Net deferred tax assets	58,930	57,557
Valuation allowance, net of federal tax	$ 5,200	$ 5,400