Contractual interest rate for funds borrowed, under the debt agreement.

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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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Carrying value as of the balance sheet date of notes payable (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

+ 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)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Long-Term Debt (Details) - USD ($)	Dec. 05, 2016	May 26, 2016	Sep. 22, 2006	Mar. 31, 2018	Dec. 31, 2017	Dec. 13, 2017
Debt Instrument [Line Items]
Notes Payable				$ 161,009,000	$ 161,364,000
BB&T Term Note Payable
Debt Instrument [Line Items]
Notes Payable		$ 5,200,000
Interest rate (percentage)					1.65%
Debt Instrument, Term		15 years
Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Term	10 years
Florida State Board of Administration
Debt Instrument [Line Items]
Notes Payable			$ 20,000,000
Debt Instrument, Term			20 years
150M Senior Notes
Debt Instrument [Line Items]
Notes Payable						$ 150,000,000
Interest rate (percentage)						6.25%