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Debt Commitments - Debt Obligations and Letters of Credit Outstanding (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Total debt	$ 489,000,000	$ 500,000,000
Less: Current portion of debt	(4,400,000)	(3,000,000)
Long-term debt	484,600,000	497,000,000
Credit Facility | Unsecured Revolving Credit Facility
Debt Instrument [Line Items]
Total debt	335,000,000	365,000,000
Credit Facility | Letter of Credit Subfacility
Debt Instrument [Line Items]
Outstanding letters of credit under unsecured revolving credit facility - contingent obligation	36,300,000	36,300,000
Senior Unsecured Promissory Notes | 2.00% Senior Unsecured Promissory Note Payable
Debt Instrument [Line Items]
Total debt	$ 40,000,000	40,000,000
Fixed interest rate per annum	2.00%
Senior Unsecured Promissory Notes | 2.45% Senior Unsecured Promissory Note Payable
Debt Instrument [Line Items]
Total debt	$ 35,000,000	35,000,000
Fixed interest rate per annum	2.45%
Senior Unsecured Promissory Notes | 3.22% Senior Unsecured Promissory Note Payable
Debt Instrument [Line Items]
Total debt	$ 60,000,000	60,000,000
Fixed interest rate per annum	3.22%
Industrial Revenue Bonds
Debt Instrument [Line Items]
Total debt	$ 19,000,000	$ 0

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- Definition

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

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-Publisher FASB
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-SubTopic 10
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