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Financing Obligations - Narrative (Details) $ in Millions |  | 12 Months Ended
--- | --- | ---
Oct. 10, 2017 USD ($) property period | Dec. 31, 2017 USD ($)
Leases [Abstract] |  |
Sale leaseback transaction, number of properties | property | 42 |
Sale leaseback transaction, gross proceeds, financing activities | $ 119.5 |
Sale leaseback transaction, lease term, period (in years) | 20 years |
Sale leaseback transaction, renewal term, number of additional terms | period | 5 |
Sale leaseback transaction, length of each additional period (in years) | 5 years |
Deferred finance costs, issuance costs |  | $ 2.7
Non-cash interest expense related to amortization of deferred financing issuance costs |  | $ 0.1

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- Definition Sale Leaseback Transaction, Length Of Each Additional Period + References No definition available. + Details
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- Definition Amount of issuance costs recognized in a share-lending arrangement entered into by the entity, in contemplation of a convertible debt offering or other financing, after deduction of accumulated amortization or the effects of subsequent adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 2A -URI http://asc.fasb.org/extlink&oid=7656903&loc=SL6757479-112611 + Details
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- Definition Amount of cash inflow before closing and debt issuance costs received by a seller-lessee in a sale-leaseback recognized in financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=82846721&loc=d3e51831-112757 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 51 -URI http://asc.fasb.org/extlink&oid=82846721&loc=d3e51840-112757 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=82846721&loc=d3e51843-112757 + Details
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