Business Combinations and Divestiture (Narrative) (Details) - USD ($) $ in Thousands				3 Months Ended		9 Months Ended
	Jun. 10, 2015	May. 29, 2015	May. 01, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Business Acquisition [Line Items]
Purchase price						$ 387,391	$ 0
Sale price of business						290,543	101,179
Gain on sale of business						109,069	29,104
Imagitas
Business Acquisition [Line Items]
Sale price of business		$ 292,000
Gain on sale of business		$ 111,000
Borderfree
Business Acquisition [Line Items]
Percentage of business acquired	100.00%
Purchase price	$ 381,000
Cash acquired	92,000
Revenues				$ 25,000		31,000
Pro forma revenues					$ 31,000	$ 47,000	$ 89,000
Borderfree | Selling, general and administrative expense
Business Acquisition [Line Items]
Accelerated stock-based compensation expense	10,000
Borderfree | Other (Income) Expense, Net
Business Acquisition [Line Items]
Acquisition-related costs	$ 8,000
Real Time Content
Business Acquisition [Line Items]
Payment to acquire business			$ 6,000