Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2019

Accounting Policies [Abstract]

Schedule of Revenue Disaggregated by Type of Revenue and Geographic Region

The nature, amount, timing and uncertainty of our revenues and how revenues and cash flows are affected by economic factors is most appropriately depicted by type of revenues and by geographic region (using the location of the client as the basis of attributing revenues to the individual regions) as follows (in thousands):

	Quarter Ended				Six Months Ended
	June 30,				June 30,
	2019		2018		2019		2018
Cloud and related solutions	$	222,183	$	187,401	$	441,773	$	364,917
Software and services		12,173		13,331		25,201		25,290
Maintenance		11,500		12,301		23,675		24,530
Total revenues	$	245,856	$	213,033	$	490,649	$	414,737

	Quarter Ended				Six Months Ended
	June 30,				June 30,
	2019		2018		2019		2018
Americas (principally the U.S.)	$	214,390	$	180,217	$	425,120	$	350,120
Europe, Middle East, and Africa		22,606		21,977		47,232		42,411
Asia Pacific		8,860		10,839		18,297		22,206
Total revenues	$	245,856	$	213,033	$	490,649	$	414,737

Fair Value Measurements

The following table represents the fair value hierarchy based upon three levels of inputs, of which Levels 1 and 2 are considered observable and Level 3 is unobservable, for our financial assets measured at fair value (in thousands):

	June 30, 2019						December 31, 2018
	Level 1		Level 2		Total		Level 1		Level 2		Total
Cash equivalents:
Money market funds	$	4,254	$	—	$	4,254	$	4,392	$	—	$	4,392
Commercial paper		—		10,626		10,626		—		9,078		9,078
Short-term investments:
Corporate debt securities		—		12,834		12,834		—		16,357		16,357
U.S. government agency bonds		—		650		650		—		3,724		3,724
Asset-backed securities		—		4,190		4,190		—		3,522		3,522
Total	$	4,254	$	28,300	$	32,554	$	4,392	$	32,681	$	37,073

Carrying Value (Par Value for Convertible Debt) and Estimated Fair Value of Debt

We have chosen not to measure our debt at fair value, with changes recognized in earnings each reporting period.  The following table indicates the carrying value (par value for convertible debt) and estimated fair value of our debt as of the indicated periods (in thousands):

	June 30, 2019				December 31, 2018
	Carrying		Fair		Carrying		Fair
	Value		Value		Value		Value
2018 Credit Agreement (carrying value including current maturities)	$	140,625	$	140,625	$	144,375	$	144,375
2016 Convertible debt (par value)		230,000		254,438		230,000		228,275