Business Combinations (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended			6 Months Ended		0 Months Ended	1 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012	Jun. 30, 2013 BSI, TAIMMA, FINTECHNIX, PLANETSOFT, TRISYSTEMS [Member] Companies	Jun. 30, 2013 Qatarlyst [Member] Companies	Jun. 02, 2012 Planetsoft [Member]	Jun. 30, 2012 Planetsoft [Member]	Jun. 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]	Jun. 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]	Jun. 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
Number of Businesses Acquired with Preliminary Valuation and Purchase Price Allocation							1
Business Acquisition, Earnout Accrual Adjustment	$ 5,814,000		$ 6,114,000	$ 0
Derivative financial instruments, liabilities, fair value disclosure	15,498,000		15,498,000		17,495,000											15,498,000	17,495,000
Business acquisition, contingent consideration, at fair value, noncurrent	9,155,000		9,155,000		14,230,000											9,200,000	14,200,000
Business acquisition, contingent consideration, at fair value, current	6,343,000		6,343,000		3,265,000											6,300,000	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									2,500,000	1,400,000
Business acquisition, acquiree revenue since acquisition date										7,900,000
Goodwill	333,872,000		333,872,000		326,748,000								44,100,000
Business acquisition, intangible assets (excluding goodwill)											9,800,000	540,000
Business acquisition, fair value of contingent consideration								$ 10,200,000