Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Components of Deferred Tax Assets
Deferred tax assets - non current	$ 36,278	$ 29,924
Deferred tax liabilities - non current	(19,254)	(13,681)
Net operating losses	32,394	35,924
Accrued liabilities	24,452	23,719
Deferred compensation	15,052	12,031
Accrued compensation	7,239	7,735
Deferred revenue	13,219	8,458
Tax credits	5,223	6,850
Equity awards	4,894	4,419
Depreciation	15,424	9,960
Operating lease liability	13,140	0
Other, net	1,817	0
Valuation allowance	(22,786)	(21,333)
Total deferred tax assets	110,068	87,763
Intangible assets	(24,097)	(26,543)
Capitalized transaction costs	(16,797)	(16,643)
Accounting method change	(7,019)	0
Prepaid expenses and other	(32,493)	(28,214)
Lease right-of-use assets	(12,638)	0
Other, net	0	(120)
Total deferred tax liabilities	(93,044)	(71,520)
Total net deferred tax assets	$ 17,024	$ 16,243