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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 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 + Details
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