Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Name:	us-gaap_GoodwillImpairmentLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Goodwill (Details) - USD ($)	12 Months Ended
Goodwill (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill impairment	$ 0
Goodwill [Line Items]
Goodwill	177,800,000	$ 180,800,000	$ 178,600,000
Services
Goodwill [Line Items]
Goodwill	69,100,000	$ 72,100,000	$ 69,900,000
BPO services \| Services
Goodwill [Line Items]
Goodwill	$ 10,400,000