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Long-term Debt - Schedule of Notes Payable (Details) - Other Notes Payable [Member] - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |
Notes payable | $ 82.3 | $ 55.8
Notes Payable, Real Estate Sale / Leaseback Financing [Member] |  |
Debt Instrument [Line Items] |  |
Notes payable | 77.7 | 48.2
Notes Payable, LIBOR plus 2.5% Construction Financing [Member] | LIBOR [Member] |  |
Debt Instrument [Line Items] |  |
Notes payable | $ 4.4 | $ 7.4
Effective interest rate (percent) | 3.90% | 3.10%
Spread on variable rate (percent) | 2.50% | 2.50%
Notes Payable, 6.80% Financing [Member] |  |
Debt Instrument [Line Items] |  |
Notes payable | $ 0.2 | $ 0.2
Effective interest rate (percent) | 6.80% | 6.80%
Minimum [Member] | Notes Payable, Real Estate Sale / Leaseback Financing [Member] |  |
Debt Instrument [Line Items] |  |
Effective interest rate (percent) | 7.50% | 7.50%
Maximum [Member] | Notes Payable, Real Estate Sale / Leaseback Financing [Member] |  |
Debt Instrument [Line Items] |  |
Effective interest rate (percent) | 11.20% | 11.20%

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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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