The percentage of the face amount of the debt instrument applicable to the change in ownership.

No definition available.

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- Definition

Debt instrument, percentage of redemption price, redemption date, latest for redemption at face amount

+ References

No definition available.

+ Details

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- Definition

The percentage of the face amount applicable to the first set in the series of latest date, before maturity, on which the issuer can call the outstanding debt instrument for repayment or conversion to equity.

+ References

No definition available.

+ Details

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- Definition

Debt Instrument, Percentage Of Redemption Price, Redemption Date Three

+ References

No definition available.

+ Details

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- Definition

The percentage of the face amount applicable to the second set in the series of latest date, before maturity, on which the issuer can call the outstanding debt instrument for repayment or conversion to equity

+ References

No definition available.

+ Details

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- Definition

The percentage of the face amount that can be redeemed, applicable to the additional set in the series of latest date, before maturity, on which the issuer can call the outstanding debt instrument for repayment or conversion to equity.

+ References

No definition available.

+ Details

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- Definition

The latest date, before maturity, on which the issuer can call the outstanding debt instrument for repayment or conversion to equity at face amount, which may be presented in a variety of ways (year only, month and year, day, month and year, quarter, etc.).

+ References

No definition available.

+ Details

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- Definition

The first set in the series of latest date, before maturity, on which the issuer can call the outstanding debt instrument for repayment or conversion to equity, which may be presented in a variety of ways (year only, month and year, day, month and year, quarter, etc.).

+ References

No definition available.

+ Details

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- Definition

Debt Instrument, Redemption Date, Three

+ References

No definition available.

+ Details

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- Definition

The second set in the series of latest date, before maturity, on which the issuer can call the outstanding debt instrument for repayment or conversion to equity, which may be presented in a variety of ways (year only, month and year, day, month and year, quarter, etc.).

+ References

No definition available.

+ Details

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- References

No definition available.

+ Details

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- 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
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Period Type:	instant

- Definition

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

+ References

+ Details

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

- Definition

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

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of principal amount of debt redeemed.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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- Definition

Amount of gain (loss) from the difference between the repurchase price of a debt instrument initially issued by the entity and the net carrying amount of the debt at the time of its repurchase.

+ References

No definition available.

+ Details

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

- Definition

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

+ References

No definition available.

+ Details

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

- 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

+ Details

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

- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

+ References

+ Details

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Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of increase (decrease) of the credit facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

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

- Definition

The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ 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 470
-SubTopic 10
-Section 45
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=99376301&loc=d3e1314-112600

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 45
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=99376301&loc=d3e1336-112600

+ Details

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

- Definition

The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

+ References

No definition available.

+ 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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Debt (Details Textual) - USD ($)						3 Months Ended	12 Months Ended	37 Months Ended
Debt (Details Textual) - USD ($)	May 01, 2024	May 03, 2016	Mar. 23, 2016	Oct. 23, 2014	Mar. 20, 2013	Mar. 31, 2018	Dec. 31, 2016	May 01, 2019	Dec. 31, 2017
Debt [Line Items]
Amount outstanding under the line of credit						$ 59,016,000			$ 0
Amount of letters of credit outstanding						$ 5,248,000
6.50% Notes due 2024
Debt [Line Items]
Interest rate, stated percentage						6.50%
6.75% Notes
Debt [Line Items]
Interest rate, stated percentage					6.75%
Loss on redemption of notes							$ 33,298
Percentage of redemption price, redemption date one (percent)			103.375%
Wells Fargo Capital Finance, LLC
Debt [Line Items]
Debt instrument, maturity date		May 03, 2021		Sep. 30, 2019
Long-term line of credit					$ 225,000,000
Expiration date of credit facility					Dec. 31, 2018
Increase in line of credit facility				$ 100,000,000
Maximum borrowing capacity				$ 325,000,000
Wells Fargo Capital Finance, LLC \| Base Rate
Debt [Line Items]
Interest rate, stated percentage		1.75%		1.00%
Wells Fargo Capital Finance, LLC \| London Interbank Offered Rate (LIBOR)
Debt [Line Items]
Interest rate, stated percentage				1.75%
Wells Fargo Capital Finance, LLC \| Non-Prime Rate and Prime Rate on European Advances
Debt [Line Items]
Interest rate, stated percentage		1.50%
Senior Notes \| 6.50% Notes due 2024
Debt [Line Items]
Aggregate principal amount			$ 900,000
Interest rate, stated percentage			6.50%			6.50%
Debt instrument, maturity date			May 01, 2024
Proceeds from offering			$ 880,000
Debt instrument, redemption date, one						May 01, 2019
Percentage of redemption price, redemption date one (percent)						104.875%
Percentage of redemption price, redemption date two (percent)						103.25%
Debt instrument, redemption date, two						May 01, 2020
Percentage of redemption price, redemption date three (percent)						101.625%
Debt instrument, redemption date, three						May 01, 2021
Percentage of redemption price, redemption date, latest for redemption at face amount (percent)						100.00%
Debt instrument, redemption date, latest for redemption at face amount						May 01, 2022
Percentage redeemable redemption date, additional (percent)						106.50%
Percentage of redemption price, change in ownership control (percent)						101.00%
Forecast \| Wells Fargo Capital Finance, LLC \| 6.50% Notes due 2024
Debt [Line Items]
Debt instrument, maturity date	May 01, 2024
Optional Redemption \| Forecast \| 6.50% Notes due 2024
Debt [Line Items]
Percentage of redemption price redemption date, additional (percent)								35.00%