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Fair Value Measurements and Derivative Instruments Reporting (Derivative instruments location and fair value amounts) (Details) - Not Designated as Hedging Instrument [Member] - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Derivatives, Fair Value [Line Items] |  |
Gross recognized Assets | $ 275 | $ 0
Gross recognized (Liabilities) | 0 | (129)
Gross Amounts Offset | 0 | 0
Net Recognized Fair Value Assets | 275 | 0
Net Recognized Fair value (Liabilities) | 0 | (129)
Interest Rate Swap - Current [Member] | Other Current Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross recognized Assets | 77 | 0
Gross Amounts Offset | 0 | 0
Net Recognized Fair Value Assets | 77 | 0
Interest Rate Swap - Current [Member] | Accrued Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross recognized (Liabilities) | 0 | (55)
Gross Amounts Offset | 0 | 0
Net Recognized Fair value (Liabilities) | 0 | (55)
Interest Rate Swap - Non-Current [Member] | Deposits And Other [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross recognized Assets | 198 | 0
Gross Amounts Offset | 0 | 0
Net Recognized Fair Value Assets | 198 | 0
Interest Rate Swap - Non-Current [Member] | Taxes Payable and Other [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Gross recognized (Liabilities) | 0 | (74)
Gross Amounts Offset | 0 | 0
Net Recognized Fair value (Liabilities) | $ 0 | $ (74)

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- Definition Fair value, after effects of master netting arrangements, deduction of assets not subject to a master netting arrangement and elected not to be offset, of 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, offset against an obligation to return collateral. + 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 (e) -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 210 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226016-175313 + Details
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- Definition Fair value, before 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 elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=82924980&loc=SL51823488-111719 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226000-175313 + Details
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