Notes Payable - Additional Information (Details) - USD ($)	3 Months Ended
Mar. 31, 2019	Mar. 30, 2016
Debt Instrument [Line Items]
Minimum Repayment of Aggregate Principal Amount of Senior Notes (as a percent)	5.00%
Outstanding Principal Amount of Senior Notes (as a percent)	100.00%
Parent Company [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 170,000,000
Parent Company [Member] \| Series A Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 38,000,000
Debt Instrument, Interest Rate, Stated Percentage		4.88%
Parent Company [Member] \| Series B Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 67,000,000
Debt Instrument, Interest Rate, Stated Percentage		5.23%
Parent Company [Member] \| Series C Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 48,000,000
Debt Instrument, Interest Rate, Stated Percentage		5.48%
Parent Company [Member] \| Series D Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 17,000,000
Debt Instrument, Interest Rate, Stated Percentage		5.58%

Minimum Repayment Of Aggregate Principal Amount Of Senior Notes

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- Definition

Outstanding Principal Amount Of Senior Notes

+ References

No definition available.

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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-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

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-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

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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-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.

+ References

No definition available.

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