Business Combinations (Narrative) (Details) $ in Thousands				3 Months Ended		12 Months Ended
	Nov. 02, 2016 USD ($)	Jul. 02, 2016 USD ($)	Sep. 02, 2015 USD ($)	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($) Companies	Nov. 01, 2016 USD ($)	Jul. 01, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 01, 2015
Business Acquisition [Line Items]
Recognized controlling ownership of joint venture				$ 1,563
Other Nonoperating Income (Expense)						$ 1,162
Document Period End Date				Mar. 31, 2017
Number of Businesses Acquired | Companies						3
Reduction of acquisition earnout accruals				$ 0	$ (511)
Derivative Liability				8,753		$ 8,510			$ 4,277
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability				0	$ 511
Goodwill, Purchase Accounting Adjustments				948		4,298
Business acquisition, contingent consideration, at fair value, noncurrent				6,810		6,589
Business acquisition, contingent consideration, at fair value, current				1,943		1,921
Goodwill				443,304		441,404			$ 402,259
WDEV [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross	$ 10,500
Derivative, Term of Contract	38 months
Payments to Acquire Business, Held in Escrow	$ 2,900
Hope [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross	$ 1,720
Maximum [Member] | WDEV [Member]
Business Acquisition [Line Items]
Derivative Liability							$ 15,700
Contingent accrued earn-out acquisition consideration [Member]
Business Acquisition [Line Items]
Derivative Liability				8,753		8,510
Business acquisition, contingent consideration, at fair value, noncurrent				6,800		6,600
Business acquisition, contingent consideration, at fair value, current				1,900		$ 1,900
EbixHealth JV [Member]
Business Acquisition [Line Items]
Recognized controlling ownership of joint venture				$ 11,293
Goodwill								$ 20,838
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill								$ 1,463
Equity Method Investment, Ownership Percentage Increase (Decrease)		11.00%
Payments to Acquire Interest in Joint Venture		$ 2,000	$ 6,000
Equity Method Investment, Ownership Percentage								51.00%		40.00%