Debt Instrument, Covenant, Interest Coverage Ratio, Minimum

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- Definition

Debt Instrument, Covenant, Leverage Ratio, Maximum

+ References

No definition available.

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- Definition

Debt Instrument, Number of Series of Debt Issued

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No definition available.

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- Definition

Line of credit facility, extension capacity.

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- Definition

Performance bonds not under the credit facility.

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No definition available.

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- Definition

Performance bonds under credit facility

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- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- Definition

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

+ References

No definition available.

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- Definition

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

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- Definition

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

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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.

+ References

No definition available.

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- Definition

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

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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

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

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- Definition

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

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- Definition

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.

+ References

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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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- 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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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Long-Term Debt (Details)	3 Months Ended
Long-Term Debt (Details)	Mar. 31, 2019 USD ($) SeriesNote	Dec. 31, 2018 USD ($)	Dec. 31, 2014 USD ($) instrument
Debt Instrument [Line Items]
Financing lease obligations	$ 0
Long-term Debt	297,000,000	$ 292,000,000
Debt Issuance Costs, Net	(2,104,000)	(2,230,000)
Long-term debt, net	$ 294,896,000	289,770,000
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	$ 17,700,000
Remaining borrowing capacity	135,300,000
Performance bonds	$ 13,300,000
Interest Rate Swap [Member]
Debt Instrument [Line Items]
Derivative, number of instruments held \| instrument			2
Derivative, notional amount			$ 50,000,000
Maximum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	2.00%
Senior Notes [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 150,000,000	150,000,000
Face amount	150,000,000
Credit Facility [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 147,000,000	$ 142,000,000
Interest coverage ratio, minimum	3.00%
Covenant leverage ratio, minimum	2.50%
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