Business Acquisitions (Narrative) (Details) (USD $)	12 Months Ended									0 Months Ended	1 Months Ended	7 Months Ended									0 Months Ended	11 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 BSI, TAIMMA, FINTECHNIX, PLANETSOFT, TRISYSTEMS [Member] Companies	Dec. 31, 2012 BSI, TAIMMA, FINTECHNIX, TRISYSTEMS [Member] Customer Relationships [Member]	Jun. 02, 2012 BSI, TAIMMA, FINTECHNIX, TRISYSTEMS [Member] Technology [Member]	Jun. 02, 2012 BSI, TAIMMA, FINTECHNIX, TRISYSTEMS [Member] Trade Names [Member]	Jun. 02, 2012 BSI, TAIMMA, FINTECHNIX, TRISYSTEMS [Member] Noncompete Agreements [Member]	Dec. 31, 2012 BSI, TAIMMA, FINTECHNIX, TRISYSTEMS [Member] Final Allocation [Member]	Jun. 02, 2012 Planetsoft [Member]	Jun. 30, 2012 Planetsoft [Member]	Dec. 31, 2012 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]	Nov. 15, 2011 Health Connect Systems [Member]	Nov. 15, 2011 Health Connect Systems [Member] Customer Relationships [Member]	Nov. 15, 2011 Health Connect Systems [Member] Technology [Member]	Nov. 30, 2011 Health Connect Systems [Member] Final Allocation [Member]	Nov. 15, 2011 Health Connect Systems [Member] Final Allocation [Member]	Feb. 07, 2011 ADAM [Member]	Dec. 31, 2011 ADAM [Member]	Dec. 31, 2012 ADAM [Member]	Feb. 07, 2011 ADAM [Member] Unexercised Stock Options [Member]	Feb. 07, 2011 ADAM [Member] Customer Relationships [Member]	Feb. 07, 2011 ADAM [Member] Technology [Member]	Feb. 07, 2011 ADAM [Member] Trademarks [Member]	Feb. 07, 2011 ADAM [Member] Final Allocation [Member]	Dec. 31, 2012 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]	May 31, 2012 Fair Value, Inputs, Level 2 [Member] Fair Value, Measurements, Recurring [Member] Planetsoft [Member]	Dec. 31, 2012 Contingent Accrued Earn-out Acquisition Consideration [Member]	Dec. 31, 2011 Contingent Accrued Earn-out Acquisition Consideration [Member]
Business Acquisition [Line Items]
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	$ 17,495,000	$ 7,590,000																														$ 17,495,000	$ 7,590,000
DerivativeFinancialInstrumentLiabilitesFairValueDisclosureNonCurrent																																14,230,000
DerivativeFinancialInstrumentLiabilitesFairValueDisclosureCurrent																																3,265,000
Business acquisition, termination fee received for failed acquisition	971,000
Number of Businesses Acquired				5
Business acquisition, cost of acquired entity, cash paid										35,000,000						18,000,000								944,000
Business acquisition, number of common shares issued										296,560											3,650,000	3,650,000
Business acquisition, price per share										$ 16.86
Share subscribed for business acquisition, Value	0	87,476,000	828,000							5,000,000.0
Put option, exercise period											30 days
Put option, vesting period required prior to exercise											2 years
Put option, price to repurchase shares, discount											10.00%
Put option liability	1,186,000	0																											1,200,000	1,400,000	1,400,000
Business acquisition, purchase price allocation, goodwill	326,748,000	259,218,000	180,602,000	67,376,000											44,100,000				20,400,000									60,100,000
Business acquisition, purchase price allocation, intangible assets (excluding goodwill)					7,600,000	1,800,000	436,000	118,000					9,800,000	540,000			1,200,000	256,000							15,400,000	2,100,000	2,000,000
Contingent liability for accrued earn-out acquisition consideration	3,265,000	7,590,000								10,200,000						4,000,000
Fair value of equity issued in business acquisition										5,000,000											87,500,000
Business acquisition, acquiree revenue since acquisition date												11,400,000										23,100,000	23,500,000
Business Acquisition, Purchase Price Allocation, Goodwill Amount									$ 23,300,000						$ 44,100,000					$ 20,400,000								$ 60,100,000