Goodwill and Acquired Intangible Assets, Net (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2013 Epay Segment [Member]
Goodwill and Finite-lived Intangible Assets Rollforward [Roll Forward]
Finite-Lived Intangible Assets, Net	$ 88,943,000	$ 93,026,000
Finite-Lived Intangible Assets, Amortization Expense	(4,841,000)
Finite-lived intangible assets, other changes	758,000
Goodwill	499,680,000	498,435,000
Goodwill, Other Changes	1,245,000
Total intangible assets, net, including goodwill	588,623,000	591,461,000
Total intangible assets amortization expense	(4,841,000)
Total intangible assets, other changes	2,003,000
Expected intangible amortization current year	13,400,000
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	13,000,000
Future Amortization Expense, Year Two	11,400,000
Future Amortization Expense, Year Three	9,600,000
Future Amortization Expense, Year Four	7,200,000
Future Amortization Expense, Year Five	6,300,000
Goodwill, Impairment Loss			$ 18,400,000