Goodwill and Other Intangible Assets Other Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Sep. 15, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gain (Loss) on Disposition of Intangible Assets	$ 17,149	$ 0	$ 17,149	$ 0
Gross Carrying Value, Intangible Assets	145,879		145,879			$ 152,580
Accumulated Amortization, Intangible Assets	121,851		121,851			109,665
Net Carrying Value, Intangible Assets	24,028		24,028			42,915
Proceeds from Sale of Intangible Assets			18,333	$ 0
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value, Intangible Assets	56,276		56,276			59,340
Accumulated Amortization, Intangible Assets	44,528		44,528			40,002
Net Carrying Value, Intangible Assets	11,748		11,748			19,338
Merchant relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value, Intangible Assets	11,511		11,511			12,015
Accumulated Amortization, Intangible Assets	9,474		9,474			8,475
Net Carrying Value, Intangible Assets	2,037		2,037			3,540
Trade names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value, Intangible Assets	11,999		11,999			11,534
Accumulated Amortization, Intangible Assets	9,779		9,779			8,004
Net Carrying Value, Intangible Assets	2,220		2,220			3,530
Developed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value, Intangible Assets	36,759		36,759			38,388
Accumulated Amortization, Intangible Assets	34,499		34,499			30,197
Net Carrying Value, Intangible Assets	2,260		2,260			8,191
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value, Intangible Assets	18,522		18,522			17,259
Accumulated Amortization, Intangible Assets	14,877		14,877			14,020
Net Carrying Value, Intangible Assets	3,645		3,645			3,239
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value, Intangible Assets	10,812		10,812			14,044
Accumulated Amortization, Intangible Assets	8,694		8,694			8,967
Net Carrying Value, Intangible Assets	$ 2,118		$ 2,118			$ 5,077
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life			1 year
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life			5 years
OrderUp Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gain (Loss) on Disposition of Intangible Assets			$ 17,149
Disposition of Intangible Assets, Gross Consideration Received			19,800
Noncash or Part Noncash Divestiture, Amount of Consideration Received			1,500
Proceeds from Sale of Intangible Assets			18,500
Professional Fees			$ 200
Net Book Value					$ 2,700