Debt instrument Percentage par value issued.

No definition available.

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- Definition

Leverage ratio to incur permitted additional debt description.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Secured net leverage ratio permitted, as determined based on 12 month trailing EBITDA.

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

Secured net leverage ratio to exercise incremental term loan commitments description.

+ References

No definition available.

+ Details

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

- Definition

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

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
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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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- 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

Amount, after accumulated amortization, of debt discount.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399

Reference 2: 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

+ Details

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

- Definition

Floor rate on an interest rate derivative such as an interest rate floor or collar. If market rates falls below the floor rate, a payment or receipt is triggered on the contract.

+ References

No definition available.

+ Details

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

- 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
Period Type:	instant

- 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.

+ 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 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

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

- Details

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- Details

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- Details

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Data Type:	na
Balance Type:
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- Details

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Balance Type:
Period Type:

- Details

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- Details

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- Details

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- Details

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Long-Term Debt (Senior Credit Facility Narrative) (Details)		12 Months Ended
	Apr. 29, 2016 USD ($)	Dec. 31, 2016 USD ($)	Jan. 01, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2015 USD ($)
Debt Instrument [Line Items]
Debt Instrument, Unamortized Discount		$ 24,536,000			$ 0
Secured net leverage ratio		3.93
Maximum [Member]
Debt Instrument [Line Items]
Secured net leverage ratio		4.50
Senior Credit Facility [Member]
Debt Instrument [Line Items]
Secured net leverage ratio to exercise incremental term loan commitments description		Through December 31, 2018, the Company may request to exercise Incremental Term Loan Commitments, as defined in the CS Agreement, only if the Secured Net Leverage Ratio, adjusted for the requested Incremental Term Loan borrowing, is below 3.35 to 1.00. After December 31, 2018, the Company may request to exercise Incremental Term Loan Commitments for the greater of $100 million or an amount which would produce a Secured Net Leverage Ratio of 3.35 to 1.00.
Leverage ratio to incur permitted additional debt description		Through December 31, 2018, the Company is allowed to incur Permitted Additional Debt, as defined in the CS Agreement, only Total Leverage Ratio, adjustment for the Permitted Additional Debt, is below 4.50 to 1.00. After December 31, 2018, the Company may incur Permitted Additional Debt so long as the Total Leverage Ratio, adjusted for the Permitted Additional Debt, is below 5.50 to 1.00.
Letters of credit outstanding		$ 6,500,000
Senior Credit Facility [Member] \| Term Loan Facility, maturing 2022 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 880,000,000
Debt Instrument, Unamortized Discount	$ 17,600,000
Term Facility Issued Percentage on Par Value	98.00%
Debt Instrument, Maturity Date		Apr. 29, 2022
Senior Credit Facility [Member] \| Term Loan Facility, maturing 2022 [Member] \| CS Agreement [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage		7.70%
Senior Credit Facility [Member] \| Term Loan Facility, maturing 2022 [Member] \| CS Agreement [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	5.75%
Derivative, Floor Interest Rate	1.00%
Senior Credit Facility [Member] \| Term Loan Facility, maturing 2022 [Member] \| CS Agreement [Member] \| Alternate Base Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	4.75%
Senior Credit Facility [Member] \| Term Loan Facility, maturing 2022 [Member] \| CS Amendment [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage		8.73%
Senior Credit Facility [Member] \| Term Loan Facility, maturing 2022 [Member] \| CS Amendment [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		6.75%
Derivative, Floor Interest Rate		1.00%
Senior Credit Facility [Member] \| Term Loan Facility, maturing 2022 [Member] \| CS Amendment [Member] \| Alternate Base Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		5.75%
Senior Credit Facility [Member] \| Revolving Credit Facility, maturing 2021 [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 100,000,000
Debt Instrument, Maturity Date		Apr. 29, 2021
Line of credit, outstanding balance		$ 0
Senior Credit Facility [Member] \| Revolving Credit Facility, maturing 2021 [Member] \| CS Amendment [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		2.75%
Derivative, Floor Interest Rate		0.00%
Senior Credit Facility [Member] \| Revolving Credit Facility, maturing 2021 [Member] \| CS Amendment [Member] \| Alternate Base Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.75%
Senior Credit Facility [Member] \| Revolving Credit Facility, maturing 2021 [Member] \| Scenario Forecast [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			$ 75,000,000	$ 87,500,000