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Derivative Instruments (Schedule of Derivative Instruments, Fair Value) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Derivative instruments	$ 35,069	$ 0
Derivatives Designated As Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Assets (Liabilities) Derivative, Fair Value	11,833	(30,591)
Derivatives Designated As Hedging Instruments [Member] | Cross-Currency Interest Rate Swaps [Member] | Derivative Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative fair value of non-current asset	7,506	10,615
Derivative fair value of current liability	15,522	19,876
Cash Flow Hedging [Member] | Derivatives Designated As Hedging Instruments [Member] | Forward Contracts [Member] | Other Receivables [Member]
Derivatives, Fair Value [Line Items]
Assets (Liabilities) Derivative, Fair Value		309	$ 0
Cash Flow Hedging [Member] | Derivatives Designated As Hedging Instruments [Member] | Forward Contracts [Member] | Accrued Payroll and Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Assets (Liabilities) Derivative, Fair Value	(517)	(100)
Cash Flow Hedging [Member] | Derivatives Designated As Hedging Instruments [Member] | Cross-Currency Interest Rate Swaps [Member] | Derivative Instruments [Member]
Derivatives, Fair Value [Line Items]
Assets (Liabilities) Derivative, Fair Value	7,835	(3,274)
Cash Flow Hedging [Member] | Derivatives Designated As Hedging Instruments [Member] | Call Spread [Member] | Derivative Instruments [Member]
Derivatives, Fair Value [Line Items]
Assets (Liabilities) Derivative, Fair Value	(10,908)	0
Cash Flow Hedging [Member] | Derivatives Designated As Hedging Instruments [Member] | Coupon-only Swap [Member] | Derivative Instruments [Member]
Derivatives, Fair Value [Line Items]
Assets (Liabilities) Derivative, Fair Value	15,114	0
Fair Value Hedging [Member] | Derivatives Designated As Hedging Instruments [Member] | Cross-Currency Interest Rate Swaps [Member] | Derivative Instruments [Member]
Derivatives, Fair Value [Line Items]
Assets (Liabilities) Derivative, Fair Value	$ 0	$ (27,217)

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- Definition

Derivative Fair Value Of Current Liability

+ References

No definition available.

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- Definition

Derivative Fair Value Of Non-Current Asset

+ References

No definition available.

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- Definition

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13495-108611

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X

- Definition

Fair value of the assets less the liabilities of a derivative or group of derivatives.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 815
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-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 825
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-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
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-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13495-108611

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- 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.

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