Acquisitions, Intangible Assets and Goodwill (Acquisitions) (Details) - USD ($) $ in Thousands			3 Months Ended		9 Months Ended
	Jul. 01, 2016	Jan. 12, 2016	Sep. 30, 2016	Jun. 30, 2016	Sep. 30, 2016	Sep. 30, 2015
Business Acquisition [Line Items]
Consideration transferred					$ 37,942	$ 387,391
Borderfree, Inc.
Business Acquisition [Line Items]
Increase to accounts payable and other current liabilities				$ 2,000
Goodwill adjustment			$ 2,000
Proforma revenue						$ 47,000
Enroute
Business Acquisition [Line Items]
Acquisition price		$ 14,000
Maponics
Business Acquisition [Line Items]
Consideration transferred	$ 24,000