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Debt and Credit Agreements - Narrative (Details) - USD ($) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 05, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 26, 2017 | Apr. 11, 2017
Debt Instrument [Line Items] |  |  |  |  |  |
Amortization of debt financing fees |  | $ 2,292,000 | $ 1,590,000 | $ 1,590,000 |  |
Wells Fargo Bank, National Association |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt issuance cost, Amended Credit Agreement |  | 0 | 2,106,000 |  |  |
Interest expense |  | 7,500,000 | 6,300,000 | 5,300,000 |  |
Amortization of debt financing fees |  | 2,292,000 | 1,600,000 | $ 1,600,000 |  |
Carrying amount of debt |  | 140,000,000 | 217,000,000 |  |  |
Long-term debt, fair value |  | $ 143,500,000 |  |  |  |
Secured Credit Facility | Wells Fargo Bank, National Association | Line of Credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of Credit Facility | $ 400,000,000 |  |  |  |  |
Annual capital expenditure limitation per Credit Agreement | 35,000,000.0 |  |  |  |  | $ 45,000,000.0
Maximum allowed non-permitted investments per Credit Agreement | $ 10,000,000.0 |  |  |  |  | $ 20,000,000.0
Debt issuance cost |  |  | (10,100,000) |  |  |
Secured Credit Facility | Wells Fargo Bank, National Association | Line of Credit | Interest Rate Option One | LIBOR | Min |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Amounts draw under the Credit Agreements bears interest rate | 1.50% |  |  |  |  |
Secured Credit Facility | Wells Fargo Bank, National Association | Line of Credit | Interest Rate Option One | LIBOR | Max |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Amounts draw under the Credit Agreements bears interest rate | 2.25% |  |  |  |  |
Secured Credit Facility | Wells Fargo Bank, National Association | Line of Credit | Interest Rate Option Two | LIBOR | Min |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Amounts draw under the Credit Agreements bears interest rate | 0.50% |  |  |  |  |
Secured Credit Facility | Wells Fargo Bank, National Association | Line of Credit | Interest Rate Option Two | LIBOR | Max |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Amounts draw under the Credit Agreements bears interest rate | 1.25% |  |  |  |  |
Secured Credit Facility | Wells Fargo Bank, National Association | Line of Credit | Interest Rate Option Two | Federal Funds |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Amounts draw under the Credit Agreements bears interest rate | 0.50% |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, term (in years) |  | 5 years |  |  |  |
Revolving Credit Facility | Wells Fargo Bank, National Association |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Carrying amount of debt |  | $ 0 | 34,500,000 |  |  |
Revolving Credit Facility | Wells Fargo Bank, National Association | Line of Credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of Credit Facility | $ 200,000,000 |  |  |  | $ 315,000,000 |
Debt instrument, term (in years) | 5 years |  |  |  |  |
Revolving Credit Facility | Wells Fargo Bank, National Association | Line of Credit | Min |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Commitment fee percentage, unused capacity | 0.20% |  |  |  |  |
Revolving Credit Facility | Wells Fargo Bank, National Association | Line of Credit | Max |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Commitment fee percentage, unused capacity | 0.35% |  |  |  |  |
Term Loan Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, term (in years) |  | 5 years |  |  |  |
Term Loan Facility | Wells Fargo Bank, National Association |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Carrying amount of debt |  | $ 140,000,000 | $ 182,500,000 |  |  |
Term Loan Facility | Wells Fargo Bank, National Association | Line of Credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of Credit Facility | $ 200,000,000 |  |  |  |  |
Debt instrument, term (in years) | 5 years |  |  |  |  |
Periodic payment, principal percent years one and two | 5.00% |  |  |  |  |
Periodic payment, principal percent years three and four | 10.00% |  |  |  |  |
Periodic payment, principal percent year five | 15.00% |  |  |  |  |
Letter of Credit | Wells Fargo Bank, National Association |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of Credit Facility | $ 10,000,000 |  |  |  |  |
Letter of Credit | Wells Fargo Bank, National Association | Line of Credit | Min |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Commitment fee percentage | 1.50% |  |  |  |  |
Letter of Credit | Wells Fargo Bank, National Association | Line of Credit | Max |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Commitment fee percentage | 2.25% |  |  |  |  |
Swing Line Loan | Wells Fargo Bank, National Association |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of Credit Facility | $ 10,000,000 |  |  |  |  |

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- Definition Amount of amortization expense attributable to debt issuance costs. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(8)) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + 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 Period of time between issuance and maturity of debt instrument, 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 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 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://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 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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