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Long-term Debt - Schedule of Notes Payable (Details) - Other Notes Payable [Member] - USD ($) $ in Millions	12 Months Ended
	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

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

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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

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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

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