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Corporate Restructuring Costs (Reconciliation of Restructuring Liability) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, beginning balance	$ 0
Charges	41,278
Payments	(22,207)
Restructuring Reserve, ending balance	19,071
Employee Severance and Other Transition Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, beginning balance	0
Charges	6,919
Payments	(4,197)
Restructuring Reserve, ending balance	2,722
Recruitment and Relocation Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, beginning balance	0
Charges	9,952
Payments	(9,728)
Restructuring Reserve, ending balance	224
Lease Termination Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, beginning balance	0
Charges	15,571
Payments	0
Restructuring Reserve, ending balance	15,571
Third-party and Other Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, beginning balance	0
Charges	8,836
Payments	(8,282)
Restructuring Reserve, ending balance	$ 554

X

- 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)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

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-Publisher FASB
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-Topic 230
-SubTopic 10
-Section 45
-Paragraph 17
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3367-108585

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- Definition

Discloses the amount charged against the accrued restructuring reserves, or earnings if not previously accrued, during the period for the specified type of restructuring cost.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
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-Topic 420
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-Section S99
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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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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
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