Acquisition (Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Thousands	Nov. 01, 2016	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015
Business Acquisition [Line Items]
Goodwill		$ 111,116	$ 109,448	$ 110,244	$ 100,183
FreshTemp
Business Acquisition [Line Items]
Cash	$ 1,690
Purchase price payable upon completion of diligence matters	310
Fair value of contingent consideration on acquired business	1,300
Total purchase price consideration	3,300
Fair value of net tangible assets acquired	(37)
Goodwill	2,737
Total assets acquired and liabilities assumed	3,300
Purchased and Core Technology | FreshTemp
Business Acquisition [Line Items]
Fair value of identifiable intangible assets acquired	350
Customer Relationships | FreshTemp
Business Acquisition [Line Items]
Fair value of identifiable intangible assets acquired	$ 250