Represents the additional maturity term of the debt instruments.

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- Definition

Debt Instrument, Fair Value Adjustment, Net

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No definition available.

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- Definition

Represents the number of additional maturity terms of the debt instruments.

+ References

No definition available.

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- Definition

Represents the number of assets encumbered.

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No definition available.

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- Definition

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

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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.

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- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

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No definition available.

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- Definition

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

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- Definition

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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No definition available.

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- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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- Definition

Amount of the cost of borrowed funds accounted for as interest expense.

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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.

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Debt (Details)	1 Months Ended	3 Months Ended		6 Months Ended
Debt (Details)	Apr. 30, 2019 increment	Jun. 30, 2019 USD ($) asset	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) asset	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Debt
Number of Assets Encumbered \| asset		7		7
Long-term debt, gross		$ 718,646,000		$ 718,646,000		$ 626,628,000
Deferred financing costs		(931,000)		(931,000)		0
Debt, net		717,715,000		717,715,000		626,628,000
Interest Expense		$ 8,300,000	$ 8,600,000	$ 15,500,000	$ 21,800,000
Senior Unsecured Notes [Member]
Debt
Debt Instrument, Redemption Price, Percentage		103.00%
Unsecured Debt \| 6.00% Percent, Due June 2025
Debt
Number of Assets Encumbered \| asset		0		0
Interest rate		6.00%		6.00%
Long-term debt, gross		$ 502,959,000		$ 502,959,000		505,322,000
Secured Debt \| LIBOR Plus One Point Six Zero Percent [Member]
Debt
Debt Instrument, Description of Variable Rate Basis	LIBOR
Basis Spread	1.60%
Debt Instrument, Number of Additional Maturity Terms \| increment	2
Debt Instrument, Additional Maturity Term	1 year
Mortgage loans \| Four Point Zero Zero Percent Due April 2024 [Member]
Debt
Number of Assets Encumbered \| asset		3		3
Interest rate		4.00%		4.00%
Long-term debt, gross		$ 96,000,000		$ 96,000,000		0
Mortgage loans \| 4.95 Percent, Due October 2022
Debt
Number of Assets Encumbered \| asset		3		3
Interest rate		4.95%		4.95%
Long-term debt, gross		$ 90,512,000		$ 90,512,000		91,737,000
Mortgage loans \| 4.94 Percent, Due October 2022
Debt
Number of Assets Encumbered \| asset		1		1
Interest rate		4.94%		4.94%
Long-term debt, gross		$ 29,175,000		$ 29,175,000		29,569,000
Senior Unsecured Notes [Member] \| Unsecured Debt
Debt
Debt Instrument, Fair Value Adjustment, Net		27,959,200		27,959,200		30,300,000.0
4.94 Percent, Due October 2022 \| Secured Debt
Debt
Debt Instrument, Fair Value Adjustment, Net		500,000		500,000		600,000
4.95 Percent, Due October 2022 \| Secured Debt
Debt
Debt Instrument, Fair Value Adjustment, Net		$ 1,600,000		$ 1,600,000		$ 1,900,000