Business Acquisition (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Business Acquisition Contributed Total Revenue	$ 4,400
Total consideration of transaction, net of cash acquired	77,000
Purchase accounting adjustments (1)	(1,004)
Goodwill, Acquired During Period	59,068
Business Acquisition, Purchase Price Allocation, Goodwill, Expected Tax Deductible Amount	1,000
Business Cloud Services Segment [Member]
Purchase accounting adjustments (1)	(1,014)
Goodwill, Acquired During Period	$ 58,033