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v3.8.0.1

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 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. + References No definition available. + Details
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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. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + 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(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition 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. + References No definition available. + Details
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- Definition 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. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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