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Debt - Additional Information (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 05, 2016 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Dec. 26, 2017 | Apr. 11, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayment of debt and revolving credit facility |  |  |  | $ 12,500,000 | $ 70,500,000 |  |  |
Interest expense |  | $ 1,900,000 | $ 1,500,000 | 3,800,000 | 3,000,000 |  |  |
Amortization of debt financing fees |  | 600,000 | $ 400,000 | 1,145,000 | $ 795,000 |  |  |
Wells Fargo Bank, National Association |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from lines of credit |  |  |  | 0 |  |  |  |
Repayment of debt and revolving credit facility |  |  |  | 12,500,000 |  |  |  |
Amortization of debt financing fees |  |  |  | 1,145,000 |  |  |  |
Carry amount of debt |  | 204,500,000 |  | 204,500,000 |  | $ 217,000,000 |  |
Fair value of debt |  | 207,400,000 |  | 207,400,000 |  |  |  |
Wells Fargo Bank, National Association | Secured Debt | Line of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 400,000,000 |  |  |  |  |  |  |
Annual capital expenditure limitation per Credit Agreement | 35,000,000 |  |  |  |  |  |  | $ 45,000,000
Maximum allowed non-permitted investments per Credit Agreement | 10,000,000 |  |  |  |  |  |  | $ 20,000,000
Deferred issuance cost, gross | $ 10,100,000 |  |  |  |  |  |  |
Wells Fargo Bank, National Association | Secured Debt | Line of Credit | Credit Agreement, Interest Rate Option One | London Interbank Offered Rate (LIBOR) | Minimum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.50% |  |  |  |  |  |  |
Wells Fargo Bank, National Association | Secured Debt | Line of Credit | Credit Agreement, Interest Rate Option One | London Interbank Offered Rate (LIBOR) | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 2.25% |  |  |  |  |  |  |
Wells Fargo Bank, National Association | Secured Debt | Line of Credit | Credit Agreement, Interest Rate Option Two | London Interbank Offered Rate (LIBOR) | Minimum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 0.50% |  |  |  |  |  |  |
Wells Fargo Bank, National Association | Secured Debt | Line of Credit | Credit Agreement, Interest Rate Option Two | London Interbank Offered Rate (LIBOR) | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.25% |  |  |  |  |  |  |
Wells Fargo Bank, National Association | Secured Debt | Line of Credit | Credit Agreement, Interest Rate Option Two | Federal Funds Rate |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate | 0.50% |  |  |  |  |  |  |
Wells Fargo Bank, National Association | Revolving Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from lines of credit |  |  |  | 0 |  |  |  |
Repayment of debt and revolving credit facility |  |  |  | 5,000,000 |  |  |  |
Carry amount of debt |  | 29,500,000 |  | 29,500,000 |  | 34,500,000 |  |
Wells Fargo Bank, National Association | Revolving Credit Facility | Line of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 200,000,000 |  |  |  |  |  |  |
Debt instrument, term (in years) | 5 years |  |  |  |  |  |  |
Wells Fargo Bank, National Association | Revolving Credit Facility | Line of Credit | Minimum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Commitment fee, percentage | 0.20% |  |  |  |  |  |  |
Wells Fargo Bank, National Association | Revolving Credit Facility | Line of Credit | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Commitment fee, percentage | 0.35% |  |  |  |  |  |  |
Wells Fargo Bank, National Association | Term Loan Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from lines of credit |  |  |  | 0 |  |  |  |
Repayment of debt and revolving credit facility |  |  |  | 7,500,000 |  |  |  |
Carry amount of debt |  | $ 175,000,000 |  | $ 175,000,000 |  | $ 182,500,000 |  |
Wells Fargo Bank, National Association | Term Loan Facility | Line of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 200,000,000 |  |  |  |  |  | $ 315,000,000 |
Debt instrument, term (in years) | 5 years |  |  |  |  |  |  |
Principal periodic payment, percent, years one and two | 5.00% |  |  |  |  |  |  |
Principal periodic payment, percent, years three and four | 10.00% |  |  |  |  |  |  |
Principal periodic payment, percent, year five | 15.00% |  |  |  |  |  |  |
Wells Fargo Bank, National Association | Letter of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 10,000,000 |  |  |  |  |  |  |
Wells Fargo Bank, National Association | Letter of Credit | Line of Credit | Minimum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Participation fee, percentage | 1.50% |  |  |  |  |  |  |
Wells Fargo Bank, National Association | Letter of Credit | Line of Credit | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Participation fee, percentage | 2.25% |  |  |  |  |  |  |
Wells Fargo Bank, National Association | Swing line loan, Sub-limit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 10,000,000 |  |  |  |  |  |  |

X
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- Definition Line of Credit Facility, Periodic Payment, Principal, Percent, Year Five + References No definition available. + Details
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- Definition Line of Credit Facility, Periodic Payment, Principal, Percent, Years One And Two + References No definition available. + Details
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- Definition Line of Credit Facility, Periodic Payment, Principal, Percent, Years Three And Four + References No definition available. + Details
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- Definition Long-term Line of Credit, Gross + References No definition available. + Details
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- Definition Maximum allowed non-permitted investments per Credit Agreement + References No definition available. + Details
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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 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 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 Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 Amount of the cost of borrowed funds accounted for as interest expense for debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6036836-161870 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 + 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 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 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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- Definition The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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