Subsequent Event - Narrative (Details) - USD ($)		9 Months Ended
Oct. 24, 2018	Sep. 30, 2018
Subsequent Event [Line Items]
Leverage ratio		161.00%
Subsequent Event \| 2018 Credit Agreement
Subsequent Event [Line Items]
Financial covenants leverage ratio step up	400.00%
Minimum amount for material acquisition	$ 50,000,000
Annual share repurchase limit on leverage ratio basis	$ 20,000,000
Leverage ratio required for dividend or share activity	275.00%
Maximum additional dividend permitted annually on leverage ratio basis	$ 15,000,000
Subsequent Event \| 2018 Credit Agreement \| Minimum
Subsequent Event [Line Items]
Interest coverage ratio	300.00%
Leverage ratio	350.00%
Subsequent Event \| 2018 Credit Agreement \| Revolving Credit Facility
Subsequent Event [Line Items]
Borrowing capacity on line of credit	$ 450,000,000
Additional borrowing capacity on line of credit	$ 250,000,000

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://fasb.org/us-gaap/role/ref/legacyRef
-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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- Definition

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

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- Definition

Annual share repurchase limit on leverage ratio basis.

+ References

No definition available.

+ Details

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- Definition

Debt covenant interest coverage ratio.

+ References

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- Definition

Debt covenant leverage ratio.

+ References

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- Definition

Debt Covenant, Leverage Ratio Required for Dividend or Share Activity, Maximum

+ References

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- Definition

Debt covenant leverage ratio step up.

+ References

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- Definition

Line of Credit Facility, Additional Borrowing Capacity

+ References

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+ Details

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- Definition

Maximum additional dividend permitted annually on leverage ratio basis.

+ References

No definition available.

+ Details

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- Definition

Minimum amount for material acquisition.

+ References

No definition available.

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