Business Combinations (Narrative) (Details) (USD $)	3 Months Ended			3 Months Ended	0 Months Ended	1 Months Ended	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 BSI, TAIMMA, FINTECHNIX, PLANETSOFT, TRISYSTEMS [Member] Companies	Jun. 02, 2012 Planetsoft [Member]	Jun. 30, 2012 Planetsoft [Member]	Mar. 31, 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]	Mar. 31, 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]	Mar. 31, 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				5
Derivative financial instruments, liabilities, fair value disclosure		$ 16,433,000	$ 17,495,000										$ 16,433,000	$ 17,495,000
Business acquisition, contingent consideration, at fair value, noncurrent		14,027,000	14,230,000										14,000,000	14,200,000
Business acquisition, contingent consideration, at fair value, current		2,406,000	3,265,000										2,400,000	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		1,105,000	1,186,000								1,100,000	1,400,000
Business acquisition, acquiree revenue since acquisition date							4,000,000
Business acquisition, purchase price allocation, goodwill										44,100,000
Business acquisition, purchase price allocation, intangible assets (excluding goodwill)								9,800,000	540,000
Business acquisition, fair value of contingent consideration					$ 10,200,000