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Long-term debt (Details) $ / shares in Units, $ in Millions				1 Months Ended		12 Months Ended
	Nov. 14, 2017 USD ($) shares	Aug. 12, 2016 shares $ / shares	Dec. 11, 2013	Dec. 28, 2017 USD ($) shares	Jan. 29, 2014 USD ($) shares $ / shares	Dec. 31, 2017 USD ($) Institution
Long-Term Debt [Line Items]
Interest rate percentage						2.875%
Debt instrument amortization period					7 years
Letter of credit, outstanding amount						$ 1.0
Eurocurrency [Member]
Long-Term Debt [Line Items]
Debt instrument, basis spread on variable rate						1.00%
Eurocurrency [Member] | Minimum [Member]
Long-Term Debt [Line Items]
Debt instrument, basis spread on variable rate						1.50%
Eurocurrency [Member] | Maximum [Member]
Long-Term Debt [Line Items]
Debt instrument, basis spread on variable rate						2.50%
Base Rate [Member] | Minimum [Member]
Long-Term Debt [Line Items]
Debt instrument, basis spread on variable rate						0.50%
Base Rate [Member] | Maximum [Member]
Long-Term Debt [Line Items]
Debt instrument, basis spread on variable rate						1.50%
Federal Funds Rate [Member]
Long-Term Debt [Line Items]
Debt instrument, basis spread on variable rate						0.50%
Revolving Credit Facility [Member]
Long-Term Debt [Line Items]
Outstanding credit facility						$ 0.0
BAML Revolving Credit Facility [Member]
Long-Term Debt [Line Items]
Maturity date			Dec. 11, 2018
Credit Agreement [Member]
Long-Term Debt [Line Items]
Maturity date						Sep. 29, 2022
Number of lending institutions | Institution						4
Current borrowing capacity						$ 200.0
Borrowing capacity with accordion feature						100.0
Maximum borrowing capacity						$ 300.0
Debt covenant, consolidated debt service coverage ratio, minimum						2.50
Debt covenant, leverage ratio, maximum						3.50
Credit Agreement [Member] | Minimum [Member]
Long-Term Debt [Line Items]
Commitment fee percentage						0.25%
Credit Agreement [Member] | Maximum [Member]
Long-Term Debt [Line Items]
Commitment fee percentage						0.40%
Debt covenant, leverage ratio, maximum						4.00
2.875% Convertible Senior Notes Due 2021 [Member]
Long-Term Debt [Line Items]
Face amount of debt instrument	$ 250.0			$ 239.4	$ 250.0	$ 10.6
Interest rate percentage	2.875%				2.875%
Maturity date					Jan. 15, 2021
Conversion rate of notes per $1,000 principal amount (in shares) | shares	32.386	32.3860		8.5	30.8821
Additional conversion rate of notes per $1,000 principal amount (in shares) | shares	3.1556
Accrued interest on converted notes	$ 2.4
Conversion price per share (in dollars per share) | $ / shares		$ 30.88			$ 32.38
Debt issuance costs				$ 3.6	$ 8.3

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- Definition

Amount for accrued, but unpaid interest on the converted notes for the period.

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A debt service coverage ratio required to be maintained under a debt covenant agreement. The debt coverage ratio is calculated by dividing earnings before interest, taxes, depreciation and amortization for the most recent four quarters less cash taxes by the sum of current obligations and interest expense for borrowed money, in each case due and payable following four quarters.

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Maximum leverage ratio required to be maintained under a debt covenant agreement. A leverage ratio is calculated by dividing the funded debt by earnings before interest, taxes, depreciation and amortization for the most recent four quarters.

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- Definition

The number of additional equity instruments that the holder of the debt instrument would receive if the debt was converted to equity.

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No definition available.

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The number of equity instruments that the holder of the debt instrument would receive if the debt was converted to equity.

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Number of lending institutions in which the entity has a credit facility.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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The price per share of the conversion feature embedded in the debt instrument.

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-Name Accounting Standards Codification
-Topic 470
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-Section 50
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Remaining amortization period for discount on the liability component of convertible debt which may be settled in cash upon conversion, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Face (par) amount of debt instrument at time of issuance.

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

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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.

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

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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.

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

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The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

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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.

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Fair value of the amount outstanding under the credit facility.

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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.

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