Debt Instrument, Issuance Price, Percentage Of Par

No definition available.

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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.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

+ Details

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Balance Type:	na
Period Type:	instant

- 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.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Amount of the required periodic payments including both interest and principal payments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph e
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of the original debt instrument that was repurchased.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentRepurchasedFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- 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.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time.

+ References

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Weighted average interest rate of long-term debt outstanding calculated at point in time.

+ References

No definition available.

+ Details

Name:	us-gaap_LongtermDebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Indebtedness divided by net capital.

+ References

No definition available.

+ Details

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Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.8)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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Long-Term Debt - Narrative (Details)			3 Months Ended	6 Months Ended	12 Months Ended
Long-Term Debt - Narrative (Details)	Oct. 02, 2017 USD ($)	Apr. 28, 2017 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2017	Dec. 31, 2017 USD ($)	Dec. 31, 2016
Senior 5.125% Unsecured Notes, Due 2025 \| Term loan
Debt Instrument [Line Items]
Write off of Deferred Debt Issuance Cost			$ 2,400,000
Term Loan B, Maturing 2024
Debt Instrument [Line Items]
Debt face amount	$ 300,000,000
Variable interest rate					3.82%	3.27%
Weighted average interest rate					3.42%	3.48%
Debt periodic payment	$ 3,000,000
Term Loan B, Maturing 2020
Debt Instrument [Line Items]
Repaid debt face amount					$ 400,000,000
Financing Agreement \| Variable rate credit facility
Debt Instrument [Line Items]
Revolving credit and term loan agreement		$ 100,000,000
Unsecured subordinated notes payable
Debt Instrument [Line Items]
Unsecured subordinated notes payable stated percentage interest rate					7.25%
Debt periodic payment					$ 2,700,000
Unsecured subordinated notes payable \| Senior 5.125% Unsecured Notes, Due 2025
Debt Instrument [Line Items]
Debt face amount		$ 400,000,000
Unsecured subordinated notes payable stated percentage interest rate		5.125%
Debt Instrument, Issuance Price, Percentage Of Par		100.00%
Debt Issuance Costs, Net		$ 7,000,000
Line of Credit \| Financing Agreement Amendment \| Variable rate credit facility
Debt Instrument [Line Items]
Revolving credit and term loan agreement		$ 125,000,000
Pro forma net leverage ratio			5.5	5.5
Line of Credit \| Financing Agreement Amendment \| Variable rate credit facility \| Minimum
Debt Instrument [Line Items]
Percentage of commitment fees of total unused commitment under revolving credit facility				0.30%
Line of Credit \| Financing Agreement Amendment \| Variable rate credit facility \| Maximum
Debt Instrument [Line Items]
Percentage of commitment fees of total unused commitment under revolving credit facility				0.50%
Debt Instrument, Redemption, Period One [Member] \| Unsecured subordinated notes payable \| Senior 5.125% Unsecured Notes, Due 2025
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage		100.00%
Debt Instrument, Redemption, Period Two [Member] \| Unsecured subordinated notes payable \| Senior 5.125% Unsecured Notes, Due 2025
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage		40.00%
London Interbank Offered Rate (LIBOR) [Member] \| Term Loan B, Maturing 2024
Debt Instrument [Line Items]
LIBOR plus margin range	2.25%
London Interbank Offered Rate (LIBOR) [Member] \| Line of Credit \| Financing Agreement Amendment \| Variable rate credit facility \| Minimum
Debt Instrument [Line Items]
LIBOR plus margin range				1.75%
London Interbank Offered Rate (LIBOR) [Member] \| Line of Credit \| Financing Agreement Amendment \| Variable rate credit facility \| Maximum
Debt Instrument [Line Items]
LIBOR plus margin range				2.50%