Intangibles Assets and Goodwill - Intangibles (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Intangibles
Gross Carrying Amount	$ 745,471	$ 753,725
Amortization	(338,450)	(356,314)
Intangible Asset, net	407,021	397,411
Customer relationships
Intangibles
Gross Carrying Amount	507,905	507,944
Amortization	(190,666)	(203,822)
Intangible Asset, net	317,239	304,122
Developed technology
Intangibles
Gross Carrying Amount	89,053	89,053
Amortization	(85,967)	(86,651)
Intangible Asset, net	3,086	2,402
Trade names
Intangibles
Gross Carrying Amount	9,400	9,400
Amortization	(3,100)	(3,100)
Intangible Asset, net	6,300	6,300
Outsource contract costs
Intangibles
Gross Carrying Amount	46,342	52,378
Amortization	(27,719)	(30,414)
Intangible Asset, net	18,623	21,964
Internally developed software-Connect Platform
Intangibles
Gross Carrying Amount	36,820	39,000
Amortization	(6,278)	(6,881)
Intangible Asset, net	30,542	32,119
Trademarks
Intangibles
Gross Carrying Amount	23,379	23,378
Amortization	(23,370)	(23,370)
Intangible Asset, net	9	8
Impairment charge	3,700
Accumulated impairment losses		43,100	$ 43,100
Non compete agreements
Intangibles
Gross Carrying Amount	1,350	1,350
Amortization	(1,350)	(1,350)
Assembled workforce
Intangibles
Gross Carrying Amount	4,473	4,473
Amortization		(280)
Intangible Asset, net	4,473	4,193
Purchased software
Intangibles
Gross Carrying Amount	26,749	26,749
Amortization		(446)
Intangible Asset, net	$ 26,749	$ 26,303

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

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