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.

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 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Description of the terms of a credit facility arrangement. Terms typically include interest rate, collateral required, guarantees required, repayment requirements, and restrictions on use of assets and activities of the entity.

+ References

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Disclosure of timing of required repayments, sinking fund requirements, and other redeemable securities at fixed or determinable prices and dates in the five years immediately following the date of the latest balance sheet presented in the financial statements, and the amount thereafter to fully repay the principal of long-term debt. These disclosures may be made either on an individual debt or security basis, by type of debt or security basis, or on a combined basis.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644

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Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

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Subsequent Event (Narrative) (Details) - Unit Credit Agreement [Member] - USD ($) $ in Millions		9 Months Ended
	Oct. 18, 2018	Sep. 30, 2018	Apr. 02, 2018	Mar. 31, 2018
Subsequent Event [Line Items]
Credit facility maturity date		April 10, 2020
Line Of Credit Facility Lender Determined Amount [Member]
Subsequent Event [Line Items]
Credit facility current credit amount			$ 425.0	$ 475.0
Line Of Credit Facility Commitment Amount [Member]
Subsequent Event [Line Items]
Credit facility current credit amount			$ 425.0	$ 475.0
Fifth Amendment to Credit Agreement [Member] \| Subsequent Event [Member]
Subsequent Event [Line Items]
Fifth Amendment changes	The Fifth Amendment, among other things, (i) extends the term of the Unit credit agreement to October 18, 2023, subject to certain conditions; (ii) reduces the pricing for borrowing and non-use fees; and (iii) eliminates the requirement that the company maintain a senior indebtedness to consolidated EBITDA ratio.
Credit facility maturity date	October 18, 2023
Fifth Amendment to Credit Agreement [Member] \| Line Of Credit Facility Lender Determined Amount [Member] \| Subsequent Event [Member]
Subsequent Event [Line Items]
Credit facility current credit amount	$ 425.0
Fifth Amendment to Credit Agreement [Member] \| Line Of Credit Facility Commitment Amount [Member] \| Subsequent Event [Member]
Subsequent Event [Line Items]
Credit facility current credit amount	$ 425.0