Notes Payable - Schedule of Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Current Portion of Notes Payable	$ (37,922)	$ 0
Notes Payable	335,208	375,062
Senior Notes [Member]
Debt Instrument [Line Items]
Total	373,130	375,062
Current Portion of Notes Payable	(37,922)	0
Notes Payable	$ 335,208	375,062
Senior Notes [Member] \| Series A Senior Notes [Member]
Debt Instrument [Line Items]
Effective Annual Interest Rate (as a percent)	5.16%
Carrying Value	$ 37,922	37,873
Senior Notes [Member] \| Series A Senior Notes [Member] \| Parent Company [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.88%
Senior Notes [Member] \| Series B Senior Notes [Member]
Debt Instrument [Line Items]
Effective Annual Interest Rate (as a percent)	5.44%
Carrying Value	$ 66,640	66,581
Senior Notes [Member] \| Series B Senior Notes [Member] \| Parent Company [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.23%
Senior Notes [Member] \| Series C Senior Notes [Member]
Debt Instrument [Line Items]
Effective Annual Interest Rate (as a percent)	5.64%
Carrying Value	$ 47,623	47,595
Senior Notes [Member] \| Series C Senior Notes [Member] \| Parent Company [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.48%
Senior Notes [Member] \| Series D Senior Notes [Member]
Debt Instrument [Line Items]
Effective Annual Interest Rate (as a percent)	5.72%
Carrying Value	$ 16,850	16,842
Senior Notes [Member] \| Series D Senior Notes [Member] \| Parent Company [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.58%
Senior Notes [Member] \| Series E Senior Notes [Member]
Debt Instrument [Line Items]
Effective Annual Interest Rate (as a percent)	4.46%
Carrying Value	$ 74,318	74,282
Senior Notes [Member] \| Series E Senior Notes [Member] \| Parent Company [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.34%
Senior Notes [Member] \| Series F Senior Notes [Member]
Debt Instrument [Line Items]
Effective Annual Interest Rate (as a percent)	4.55%
Carrying Value	$ 59,441	59,422
Senior Notes [Member] \| Series F Senior Notes [Member] \| Parent Company [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.44%
Senior Notes [Member] \| Series G Senior Notes [Member]
Debt Instrument [Line Items]
Effective Annual Interest Rate (as a percent)	4.64%
Carrying Value	$ 39,623	39,613
Senior Notes [Member] \| Series G Senior Notes [Member] \| Parent Company [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.54%
Senior Notes [Member] \| Series H Senior Notes [Member]
Debt Instrument [Line Items]
Effective Annual Interest Rate (as a percent)	3.42%
Carrying Value	$ 30,713	$ 32,854
Senior Notes [Member] \| Series H Senior Notes [Member] \| Parent Company [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.33%

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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

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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.

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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.

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Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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Sum of the carrying values as of the balance sheet date of the portions of long-term notes payable due within one year or the operating cycle if longer.

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