Amount of amortization expense attributable to debt issuance costs.

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

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Face (par) amount of debt instrument at time of issuance.

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

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Debt - Schedule of Credit Agreement Terms (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Feb. 28, 2019	Jan. 31, 2019	Dec. 31, 2018
Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Unamortized debt issuance costs	$ 1,208,000			$ 1,267,000
Unsecured Revolving Credit Facility, Expiring August 2019 [Member] \| Unsecured Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Face amount of debt instrument	600,000,000
Maximum borrowing capacity		$ 600,000,000	$ 505,000,000
Revolving credit facility borrowings	0
Remaining borrowing capacity	600,000,000
Amortization of debt issuance costs	93,000
Unsecured Term Loan, Expiring January 2021 [Member] \| Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Face amount of debt instrument	$ 300,000,000		$ 300,000,000
London Interbank Offered Rate (LIBOR) [Member] \| Unsecured Revolving Credit Facility, Expiring August 2019 [Member] \| Unsecured Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	0.90%
London Interbank Offered Rate (LIBOR) [Member] \| Unsecured Term Loan, Expiring January 2021 [Member] \| Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.00%