Business Combinations (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended			9 Months Ended	0 Months Ended	1 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Sep. 30, 2013 FINTECHNIX, PLANETSOFT, TRISYSTEMS, QATARLYST [Member] Companies	Jun. 02, 2012 Planetsoft [Member]	Jun. 30, 2012 Planetsoft [Member]	Sep. 30, 2013 Planetsoft [Member]	Jun. 02, 2012 Planetsoft [Member] Customer Relationships [Member]	Jun. 02, 2012 Planetsoft [Member] Technology [Member]	Jun. 02, 2012 Planetsoft [Member] Final Allocation [Member]	Sep. 30, 2013 Fair Value, Inputs, Level 2 [Member] Fair Value, Measurements, Recurring [Member] Planetsoft [Member]	Jun. 02, 2012 Fair Value, Inputs, Level 2 [Member] Fair Value, Measurements, Recurring [Member] Planetsoft [Member]	Sep. 30, 2013 Contingent Accrued Earn-out Acquisition Consideration [Member]	Dec. 31, 2012 Contingent Accrued Earn-out Acquisition Consideration [Member]
Business Acquisition [Line Items]
Number of businesses acquired						4
Reduction of acquisition earnout accruals	$ (4,139,000)		$ (10,253,000)	$ 0
Derivative financial instruments, liabilities, fair value disclosure	14,235,000		14,235,000		17,495,000										14,235,000	17,495,000
Business acquisition, contingent consideration, at fair value, noncurrent	10,067,000		10,067,000		14,230,000										10,100,000	14,200,000
Business acquisition, contingent consideration, at fair value, current	4,168,000		4,168,000		3,265,000										4,200,000	3,300,000
Business acquisition, termination fee received for failed acquisition		971,000
Business acquisition, cost of acquired entity, cash paid							35,000,000
Business acquisition, number of common shares issued							296,560
Business acquisition, price per share							$ 16.86
Share subscribed for business acquisition, Value							5,000,000
Put option, exercise period							30 days
Put option, vesting period required prior to exercise							2 years	2 years
Put option, price to repurchase shares, discount							10.00%
Put option liability	0		0		1,186,000								2,400,000	1,400,000
Business acquisition, acquiree revenue since acquisition date									12,400,000
Goodwill	337,403,000		337,403,000		326,748,000							44,100,000
Business acquisition, intangible assets (excluding goodwill)										9,800,000	540,000
Business acquisition, fair value of contingent consideration							$ 1,000,000