The allocation percentage used for different valuation approaches when determining the fair value for Goodwill

No definition available.

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- Definition

Percentage basis points added (subtracted) to the discount rate used in determining fair value, since the last measurement date

+ References

No definition available.

+ Details

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
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+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267

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-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267

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-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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+ Details

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

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_GoodwillLineItems
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Data Type:	xbrli:stringItemType
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Period Type:	duration

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

Name:	us-gaap_GoodwillRollForward
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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Period Type:	duration

- Definition

Percentage of fair value of reporting unit in excess of carrying amount.

+ References

No definition available.

+ Details

Name:	us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
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Period Type:	instant

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=srt_LatinAmericaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Balance Type:
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- Details

Name:	us-gaap_ValuationTechniqueAxis=us-gaap_MarketApproachValuationTechniqueMember
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Balance Type:
Period Type:

- Details

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Purchased Intangible Assets and Goodwill (Changes in Goodwill) (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Oct. 01, 2018
Goodwill [Line Items]
Fair Value Input, Basis Spread on Discount Rate	70
Goodwill [Roll Forward]
Goodwill	$ 169,553	$ 169,553	$ 169,553
Accumulated impairment losses	(5,441)	(85,141)	(5,441)
Goodwill, net beginning balance	164,112	84,412	164,112
Impairment		0	(79,700)
Goodwill, ending balance		169,553	169,553
Accumulated impairment losses		(85,141)	(85,141)
Goodwill, net ending balance		84,412	84,412
United States & Canada
Goodwill [Roll Forward]
Goodwill	43,872	43,872	43,872
Accumulated impairment losses	(5,441)	(5,441)	(5,441)
Goodwill, net beginning balance	38,431	38,431	38,431
Impairment		0	0
Goodwill, ending balance		43,872	43,872
Accumulated impairment losses		(5,441)	(5,441)
Goodwill, net ending balance		38,431	38,431
Latin America
Goodwill [Roll Forward]
Goodwill	125,681	125,681	125,681
Accumulated impairment losses	0	(79,700)	0
Goodwill, net beginning balance	$ 125,681	45,981	125,681
Impairment		0	(79,700)
Goodwill, ending balance		125,681	125,681
Accumulated impairment losses		(79,700)	(79,700)
Goodwill, net ending balance		$ 45,981	45,981
Valuation, Income Approach
Goodwill [Line Items]
Fair Value, Goodwill, Valuation Approach Allocation		70.00%
Valuation, Market Approach
Goodwill [Line Items]
Fair Value, Goodwill, Valuation Approach Allocation		30.00%
Mexico
Goodwill [Line Items]
Percentage of fair value in excess of carrying amount				15.00%
Goodwill [Roll Forward]
Impairment			$ (79,700)
Minimum \| United States
Goodwill [Line Items]
Percentage of fair value in excess of carrying amount				50.00%