CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Stockholders' Equity [Abstract]
Issuance of shares of common stock for acquisition of S1 Corporation			17,355,840
Issuance of shares from treasury stock for acquisition of S1 Corporation			286,500
Repurchase of common stock, shares	3,578,427	4,970,424	4,313,076
Issuance of shares from treasury stock for common stock warrant exercises			1,084,410