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Debt (Details) - Credit Facility | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 29, 2017 USD ($) | Apr. 28, 2017 USD ($)
Citibank Credit Facility |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Maximum borrowing capacity limit |  | $ 6,000,000.0 |  |
Letters of credit, amount outstanding | $ 2,500,000 | $ 2,200,000 |  |
Line of credit, expiration period (in years) |  | 3 years |  |
Fixed interest rate, short-term |  | 1.25% |  |
Fixed interest rate, long-term |  | 1.50% |  |
Revolving Credit Facility Maturing August 2018 | Revolving Credit Facility |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Maximum borrowing capacity limit | 100,000,000.0 |  |  |
Maximum additional borrowing capacity | 150,000,000.0 |  |  |
Letters of credit, amount outstanding | 2,800,000 | $ 3,700,000 |  |
Revolving credit facility, amount outstanding | 0 | $ 0 |  |
Current borrowing capacity | $ 30,000,000 |  |  |
Maximum debt to adjusted EBITDA ratio | 2.50 |  |  |
Minimum EBITDA to interest expense ratio | 3.0 |  |  |
Covenant term, minimum liquidity (no less than) |  |  |  | $ 250,000,000
Wavier fee (as a percent) |  |  |  | 0.05%
Revolving Credit Facility Maturing August 2018 | Revolving Credit Facility | Minimum |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Commitment fee (as a percent) | 0.25% |  |  |
Revolving Credit Facility Maturing August 2018 | Revolving Credit Facility | Maximum |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Commitment fee (as a percent) | 0.375% |  |  |
Revolving Credit Facility Maturing August 2018 | Revolving Credit Facility | Federal Funds Effective Rate | Interest Option 1, Base Rate |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Basis spread on variable rate (as a percent) | 0.50% |  |  |
Revolving Credit Facility Maturing August 2018 | Revolving Credit Facility | Eurodollar | Interest Option 1, Base Rate |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Basis spread on variable rate (as a percent) | 1.00% |  |  |
Revolving Credit Facility Maturing August 2018 | Revolving Credit Facility | Eurodollar | Interest Option 1, Base Rate | Minimum |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Additional spread on variable rate (as a percent) | 0.50% |  |  |
Revolving Credit Facility Maturing August 2018 | Revolving Credit Facility | Eurodollar | Interest Option 1, Base Rate | Maximum |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Additional spread on variable rate (as a percent) | 1.50% |  |  |
Revolving Credit Facility Maturing August 2018 | Revolving Credit Facility | Eurodollar | Interest Option 2, Adjusted Eurodollar Rate |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Threshold for change in interest payment schedule (in months) | 3 months |  |  |
Revolving Credit Facility Maturing August 2018 | Revolving Credit Facility | Eurodollar | Interest Option 2, Adjusted Eurodollar Rate | Minimum |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Basis spread on variable rate (as a percent) | 1.50% |  |  |
Revolving Credit Facility Maturing August 2018 | Revolving Credit Facility | Eurodollar | Interest Option 2, Adjusted Eurodollar Rate | Maximum |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Basis spread on variable rate (as a percent) | 2.50% |  |  |
Revolving Credit Facility Maturing August 2018 | Letter of Credit |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Maximum borrowing capacity limit |  |  | $ 20,000,000.0 |
Revolving Credit Facility Maturing August 2018 | Swing Line Loan |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Maximum borrowing capacity limit |  |  | $ 10,000,000.0 |

X
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- Definition Debt Instrument, Covenant Compliance, Debt Ratio, Maximum + References No definition available. + Details
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- Definition Debt Instrument, Covenant Compliance, EBITDA To Interest Expense Ratio, Minimum + References No definition available. + Details
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- Definition Debt Instrument, Periodic Payment, Interest, Threshold For Change In Interest Payment Schedule, Period + References No definition available. + Details
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- Definition Debt Instrument, Waiver Fee as Percent of Lender’s Commitment, Percent + References No definition available. + Details
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- Definition Line of Credit Facility, Covenant Term, Minimum Liquidity + References No definition available. + Details
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- Definition Line of Credit Facility, Maximum Borrowing Capacity, Potential Increase + 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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- 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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- 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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- 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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- Definition Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + 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 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 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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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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- Definition The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate. + 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 The portion of the carrying amount of short-term borrowings outstanding as of the balance sheet date which accrues interest at a set, unchanging rate. + References No definition available. + Details
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