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Derivative Financial Instruments Derivative and Nonderivative Hedging Instrument Fair Value Disclosure (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Asset Derivatives [Abstract] |  |
Derivative Asset | $ 2,900 | $ 2,945
Liability Derivatives [Abstract] |  |
Derivative Liability | 289 | 1,383
Designated as Hedging Instrument [Member] | Other Noncurrent Assets [Member] | Interest Rate Cap [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Interest Rate Cash Flow Hedge Asset at Fair Value | 179 | 376
Designated as Hedging Instrument [Member] | Other Noncurrent Assets [Member] | Interest Rate Swap [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Interest Rate Cash Flow Hedge Asset at Fair Value | 1,712 | 1,830
Designated as Hedging Instrument [Member] | Other Current Assets [Member] | Interest Rate Cap [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Interest Rate Cash Flow Hedge Asset at Fair Value | 17 | 3
Designated as Hedging Instrument [Member] | Other Current Assets [Member] | Interest Rate Swap [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Interest Rate Derivative Assets, at Fair Value | 658 | 0
Designated as Hedging Instrument [Member] | Other Current Liabilities [Member] | Interest Rate Swap [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Interest Rate Cash Flow Hedge Asset at Fair Value | 0 | 934
Not Designated as Hedging Instrument [Member] | Other Noncurrent Assets [Member] | Interest Rate Cap [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Interest Rate Cash Flow Hedge Asset at Fair Value | 268 | 563
Not Designated as Hedging Instrument [Member] | Other Current Assets [Member] |  |
Asset Derivatives [Abstract] |  |
Foreign exchange forward contracts | 41 | 169
Not Designated as Hedging Instrument [Member] | Other Current Assets [Member] | Interest Rate Cap [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Interest Rate Cash Flow Hedge Asset at Fair Value | 25 | 4
Not Designated as Hedging Instrument [Member] | Other Current Liabilities [Member] |  |
Liability Derivatives [Abstract] |  |
Foreign exchange forward contracts | $ 289 | $ 449

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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. 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 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: 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 3: 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=77997519&loc=d3e13433-108611 Reference 4: 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 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=77997519&loc=d3e13495-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226008-175313 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or 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. Includes liabilities 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 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226008-175313 Reference 2: 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=77997519&loc=d3e13495-108611 Reference 3: 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 4: 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=77997519&loc=d3e13433-108611 Reference 5: 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 6: 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 + Details
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- Definition Fair value as of the balance sheet date of all foreign currency derivative assets not designated as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 + Details
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