Restructuring - Summary of Accruals of Restructuring Programs (Details) - 2016 and 2017 Restructuring Program - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	$ 14,740	$ 12,662
Restructuring Charges	601	16,677
Adjustments	2,057	(69)
Restructuring Charges	2,658	16,608
Payments	(8,275)	(14,530)
Restructuring reserve, ending balance	9,123	14,740
Contractual Lease Obligations
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	12,437	10,583
Restructuring Charges	0	13,501
Adjustments	2,057	(69)
Restructuring Charges	2,057	13,432
Payments	(6,022)	(11,578)
Restructuring reserve, ending balance	8,472	12,437
Severance
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	2,303	2,079
Restructuring Charges	601	3,176
Adjustments	0	0
Restructuring Charges	601	3,176
Payments	(2,253)	(2,952)
Restructuring reserve, ending balance	$ 651	$ 2,303

Restructuring Charges, Excluding Accrual Adjustments

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- Definition

Restructuring Reserve, Charges And Adjustments

+ References

No definition available.

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- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
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- Definition

Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

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- Definition

Amount of expense (reversal of expense) which increases (decreases) the restructuring reserve from an adjustment to a previously accrued restructuring liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
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- Definition

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

+ References

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