The number of outstanding letters of credit.

No definition available.

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- Definition

Number Of Debt Instruments

+ References

No definition available.

+ Details

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- Definition

Amount of amortization expense attributable to debt issuance 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
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-Section S99
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-Subparagraph (SX 210.9-04(8))
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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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- 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
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+ Details

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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.

+ Details

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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.

+ References

+ Details

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Balance Type:	debit
Period Type:	instant

- Definition

Amount of the cost of borrowed funds accounted for as interest expense for 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)
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Balance Type:	debit
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- 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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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions 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.

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-Topic 210
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+ Details

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Balance Type:	credit
Period Type:	instant

- 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

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

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- Details

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- Details

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Financing Arrangements - Additional Information (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017 USD ($) letter_of_credit	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) letter_of_credit	Sep. 30, 2016 USD ($)	Dec. 31, 2014 USD ($) instrument	Apr. 17, 2014 USD ($)
Debt Instrument [Line Items]
Number of debt instruments \| instrument					2
Amortization of deferred financing costs	$ 1,304,000	$ 1,304,000	$ 3,912,000	$ 9,487,000
Term Loan Facility \| Eurodollar Spread
Debt Instrument [Line Items]
Basis spread on variable rate			5.00%
Term Loan Facility \| ABR Spread
Debt Instrument [Line Items]
Basis spread on variable rate			4.00%
Term Loan Facility
Debt Instrument [Line Items]
Aggregate principal amount					$ 1,045,000,000
Amount outstanding	831,900,000		$ 831,900,000
Amortization of deferred financing costs	1,300,000		3,800,000
Unamortized deferred financing costs	17,700,000		17,700,000
Debt interest expense	11,700,000	$ 11,200,000	33,700,000	$ 32,400,000
JPM Revolving Facility
Debt Instrument [Line Items]
Amount outstanding	0		0
Remaining availability under credit facility	$ 147,400,000		$ 147,400,000
JPM Revolving Facility \| JPM Revolving Facility
Debt Instrument [Line Items]
Maximum borrowing capacity						$ 150,000,000.0
JPM Revolving Facility \| Letter of Credit
Debt Instrument [Line Items]
Number of letters of credit outstanding (in letter of credit) \| letter_of_credit	1		1
Amount outstanding under credit facility	$ 2,600,000		$ 2,600,000