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Long-term Debt - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2015
Debt Instrument [Line Items]
Senior notes	$ 45,000	$ 45,000
Debt instrument, due date	Jan. 03, 2021
Fixed interest rate	4.79%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.10%
Letter of Credit Fee in Percentage	1.00%
Letters of Credit Outstanding, Amount	$ 48,900	$ 61,500
Minimum [Member]
Debt Instrument [Line Items]
Interest Rate Spread added to Rate	0.00%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.10%
Maximum [Member]
Debt Instrument [Line Items]
Interest Rate Spread added to Rate	0.375%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.175%
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest Rate Spread added to Rate	1.00%
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest Rate Spread added to Rate	1.375%
2019 Credit Agreement [Member]
Debt Instrument [Line Items]
Original borrowing capacity	$ 250,000
Line of Credit Facility Accordion	150,000
Line of Credit Facility, Maximum Borrowing Capacity	400,000
Letter of Credit [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases	$ 100,000
Prior Credit Agreement [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			$ 300,000
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.125%	0.125%
Letter of Credit Fee in Percentage	1.00%	1.00%
Unsecured Senior Note Due January 3, 2021 [Member]
Debt Instrument [Line Items]
Scheduled principal payment	$ 45,000

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- Definition

The effective interest rate during the reporting period on the outstanding letters of credit.

+ References

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- Definition

Amount of additional borrowing capacity under an accordion feature within the credit agreement.

+ References

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- Definition

Amount of original borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

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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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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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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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Amount of the required periodic payments applied to principal.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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The maximum amount of borrowing capacity under a line of credit that is available as of the balance sheet date for a specific purpose other than for financing goods acquired for inventory or imminent delivery to a customer.

+ References

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- Definition

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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- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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