Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Components of Deferred Tax Assets
Deferred tax assets - non current	$ 29,924	$ 26,277
Deferred tax liabilities - non current	(13,681)	(8,757)
Net operating losses	35,924	45,041
Accrued liabilities	23,719	25,384
Deferred compensation	12,031	11,675
Accrued compensation	6,881	6,854
Deferred revenue	8,458	2,780
Tax credits	6,850	6,629
Equity awards	4,419	4,076
Other, net	0	959
Valuation allowance	(21,333)	(22,577)
Total deferred tax assets	76,949	80,821
Intangible assets	(26,543)	(30,084)
Capitalized transaction costs	(16,643)	(17,955)
Depreciation	(17,400)	(15,262)
Other, net	(120)	0
Total deferred tax liabilities	(60,706)	(63,301)
Total net deferred tax assets	$ 16,243	$ 17,520