Purchased Intangible Assets and Goodwill (Changes in Goodwill) (Details) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)
Goodwill [Roll Forward]
Goodwill		$ 169,553
Accumulated impairment losses		(85,141)
Goodwill, net beginning balance		84,412
Impairment		(45,981)
Goodwill, ending balance	$ 169,553	169,553
Accumulated impairment losses	(131,122)	(131,122)
Goodwill, net ending balance	38,431	$ 38,431
Valuation, Income Approach
Goodwill [Line Items]
Valuation approach allocation		70.00%
Valuation, Market Approach
Goodwill [Line Items]
Valuation approach allocation		30.00%
Mexico
Goodwill [Roll Forward]
Impairment	$ (46,000)
United States & Canada
Goodwill [Line Items]
Percentage of fair value in excess of carrying amount	40.00%	40.00%
Goodwill [Roll Forward]
Goodwill		$ 43,872
Accumulated impairment losses		(5,441)
Goodwill, net beginning balance		38,431
Impairment		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
Accumulated impairment losses		(79,700)
Goodwill, net beginning balance		45,981
Impairment		(45,981)
Goodwill, ending balance	125,681	125,681
Accumulated impairment losses	(125,681)	(125,681)
Goodwill, net ending balance	$ 0	$ 0

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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.

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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.

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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.

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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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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.

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

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

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