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Debt Instrument, Covenant, Leverage Ratio, Maximum

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Debt Instrument, Number of Series of Debt Issued

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Line of credit facility, extension capacity.

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Performance bonds not under the credit facility.

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Performance bonds under credit facility

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

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

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The number of derivative instruments of a particular group held by the entity.

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Present value of lessee's discounted obligation for lease payments from finance lease.

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Amount of current 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.

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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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Long-Term Debt, Net - Additional Information (Details)		12 Months Ended
Long-Term Debt, Net - Additional Information (Details)	Jun. 19, 2018	Dec. 31, 2019 USD ($)	Dec. 31, 2011 USD ($) SeriesNote	Dec. 31, 2014 instrument
Debt Instrument [Line Items]
Finance lease obligations		$ 0
Number of series of debt issued \| SeriesNote			2
Maturity date		Jun. 19, 2023
Current borrowing capacity		$ 300,000,000
Uncommitted borrowings available		100,000,000
Maximum borrowing capacity		$ 400,000,000
Basis spread on variable rate		1.375%
Performance bonds under credit facility		$ 14,900,000
Remaining borrowing capacity		128,100,000
Performance bonds		$ 5,800,000
Interest Rate Swap [Member]
Debt Instrument [Line Items]
Derivative, number of instruments held \| instrument				2
Maximum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	2.00%	2.00%
Senior Notes [Member]
Debt Instrument [Line Items]
Face amount			$ 150,000,000
Senior Notes Series A [Member]
Debt Instrument [Line Items]
Face amount			$ 75,000,000
Interest rate, effective percentage			4.01%
Maturity date			Sep. 30, 2021
Senior Notes Series B [Member]
Debt Instrument [Line Items]
Face amount			$ 75,000,000
Interest rate, effective percentage			4.11%
Maturity date			Sep. 30, 2023
Credit Facility [Member]
Debt Instrument [Line Items]
Interest coverage ratio, minimum		3.00%
Covenant leverage ratio, minimum		2.50%