Business Acquisitions (Narrative) (Details) (USD $)	12 Months Ended			0 Months Ended		1 Months Ended	0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 27, 2014	Jun. 02, 2012	Jun. 30, 2012	May 22, 2014	Nov. 03, 2014	Dec. 02, 2014	Apr. 07, 2013	May 21, 2014	Dec. 01, 2014	May 31, 2012
Business Acquisition [Line Items]
Business Acquisition, Earnout Accrual Adjustment	$ 10,237,000	$ 10,253,000	$ 699,000
Derivative Liability	5,367,000	14,420,000	17,495,000
Contingent liability for accrued earn-out acquisition consideration	4,480,000	10,283,000
Contingent liability for accrued earn-out acquisition consideration	887,000	4,137,000
Business acquisition, termination fee received for failed acquisition	971,000
Business acquisition, purchase price allocation, goodwill	402,220,000	337,068,000	326,748,000
Goodwill	402,220,000	337,068,000	326,748,000
Curepet, Inc.
Business Acquisition [Line Items]
Derivative Liability	0			5,000,000
Non-Cash portion of Acquired Entity				1,350,000
Derivative, Term of Contract				36 months
Purchase Price of Business Acquisition, Cost of Acquired Entity				6,350,000
Curepet, Inc. | Final Allocation
Business Acquisition [Line Items]
Business acquisition, purchase price allocation, goodwill				2,687,000
Goodwill				2,687,000
Qatarlyst
Business Acquisition [Line Items]
Number of Businesses Acquired		1
Business acquisition, cost of acquired entity, cash paid		5,025,000
Qatarlyst | Customer Relationships
Business Acquisition [Line Items]
Intangible Assets, Net (Excluding Goodwill)										4,800,000
Qatarlyst | Technology
Business Acquisition [Line Items]
Intangible Assets, Net (Excluding Goodwill)										635,000
Qatarlyst | Final Allocation
Business Acquisition [Line Items]
Business acquisition, purchase price allocation, goodwill		11,136,000						27,728,000		11,136,000
Goodwill		11,136,000						27,728,000		11,136,000
Planetsoft
Business Acquisition [Line Items]
Purchase Price of Business Acquisition, Cost of Acquired Entity					40,000,000
Business acquisition, number of common shares issued					296,560
Business acquisition, price per share					$ 16.86
Equity instruments					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					$ 16.86
Put option, price to repurchase shares, discount						10.00%
Fair value of equity issued in business acquisition					5,000,000
Healthcare Magic
Business Acquisition [Line Items]
Derivative Liability											596,000
Business acquisition, cost of acquired entity, cash paid							6,000,000
Healthcare Magic | Customer Relationships
Business Acquisition [Line Items]
Intangible Assets, Net (Excluding Goodwill)											452,000
Healthcare Magic | Technology
Business Acquisition [Line Items]
Intangible Assets, Net (Excluding Goodwill)											100,000
Healthcare Magic | Trademarks and Trade Names
Business Acquisition [Line Items]
Intangible Assets, Net (Excluding Goodwill)											59,000
Healthcare Magic | Noncompete Agreements
Business Acquisition [Line Items]
Intangible Assets, Net (Excluding Goodwill)											226,000
Healthcare Magic | Final Allocation
Business Acquisition [Line Items]
Business acquisition, purchase price allocation, goodwill											5,619,000
Goodwill											5,619,000
Vertex
Business Acquisition [Line Items]
Business acquisition, cost of acquired entity, cash paid								27,250,000
Vertex | Customer Relationships
Business Acquisition [Line Items]
Intangible Assets, Net (Excluding Goodwill)								2,500,000
Vertex | Technology
Business Acquisition [Line Items]
Intangible Assets, Net (Excluding Goodwill)								235,000
Vertex | Final Allocation
Business Acquisition [Line Items]
Business acquisition, purchase price allocation, goodwill								27,700,000
Goodwill								27,700,000
Oakstone
Business Acquisition [Line Items]
Business acquisition, cost of acquired entity, cash paid									31,370,000
Deferred Revenue									6,500,000
Payments to Acquire Businesses, Net									23,720,000
Net working capital adjustment									7,650,000
Oakstone | Customer Relationships
Business Acquisition [Line Items]
Intangible Assets, Net (Excluding Goodwill)									1,700,000
Oakstone | Technology
Business Acquisition [Line Items]
Intangible Assets, Net (Excluding Goodwill)									501,000
Oakstone | Final Allocation
Business Acquisition [Line Items]
Business acquisition, purchase price allocation, goodwill									28,769,000
Goodwill									28,769,000
I3
Business Acquisition [Line Items]
Business acquisition, cost of acquired entity, cash paid									2,000,000
I3 | Customer Relationships
Business Acquisition [Line Items]
Intangible Assets, Net (Excluding Goodwill)												225,000
I3 | Technology
Business Acquisition [Line Items]
Intangible Assets, Net (Excluding Goodwill)												75,000
I3 | Final Allocation
Business Acquisition [Line Items]
Business acquisition, purchase price allocation, goodwill												3,700,000
Goodwill												3,700,000
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring | Planetsoft
Business Acquisition [Line Items]
Put option liability					1,400,000								1,400,000
Contingent Accrued Earn-out Acquisition Consideration
Business Acquisition [Line Items]
Derivative Liability	5,400,000	14,400,000
Maximum | Curepet, Inc.
Business Acquisition [Line Items]
Derivative Liability				5,000,000
Maximum | Healthcare Magic
Business Acquisition [Line Items]
Derivative Liability											12,360,000
Maximum | Vertex
Business Acquisition [Line Items]
Derivative Liability								2,000,000
Maximum | I3
Business Acquisition [Line Items]
Derivative Liability												$ 4,000,000