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Debt - Additional Information (Details) - USD ($) |  |  |  | 3 Months Ended | 6 Months Ended | 18 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 03, 2017 | Dec. 02, 2016 | Jan. 05, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Apr. 11, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Repayment of debt and revolving credit facility |  |  |  |  |  | $ (70,500,000) | $ (22,500,000) |  |  |
Interest expense |  |  |  | $ 1,500,000 | $ 1,200,000 | 3,000,000 | $ 2,800,000 |  |  |
Wells Fargo Bank, National Association |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term Line of Credit, Gross |  |  |  | 200,000,000 |  | 200,000,000 |  | $ 200,000,000 |  | $ 260,500,000
Proceeds from lines of credit |  |  |  |  |  | 10,000,000 |  |  |  |
Repayment of debt and revolving credit facility |  |  |  |  |  | (70,500,000) |  | (105,000,000) |  |
Long-term debt |  |  |  | 194,436,000 |  | 194,436,000 |  | 194,436,000 |  | 254,141,000
Fair value of debt |  |  |  | 200,900,000 |  | 200,900,000 |  | 200,900,000 |  |
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 |  |  | $ 7,900,000 |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |
Long-term Line of Credit, Gross |  |  |  | 12,500,000 |  | 12,500,000 |  | 12,500,000 |  | 68,000,000
Proceeds from lines of credit |  |  |  |  |  | 10,000,000 |  |  |  |
Repayment of debt and revolving credit facility |  |  |  |  |  | (65,500,000) |  |  |  |
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 |  |  |  |  |  |  |
Proceeds from lines of credit | $ 10,000,000 | $ 40,000,000 | $ 55,000,000 |  |  |  |  |  |  |
Wells Fargo Bank, National Association | Revolving Credit Facility | Line of Credit | Minimum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Unused capacity, percentage |  |  | 0.20% |  |  |  |  |  |  |
Wells Fargo Bank, National Association | Revolving Credit Facility | Line of Credit | Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Unused capacity, percentage |  |  | 0.35% |  |  |  |  |  |  |
Wells Fargo Bank, National Association | Term Loan Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term Line of Credit, Gross |  |  |  | $ 187,500,000 |  | 187,500,000 |  | $ 187,500,000 |  | $ 192,500,000
Proceeds from lines of credit |  |  |  |  |  | 0 |  |  |  |
Repayment of debt and revolving credit facility |  |  |  |  |  | $ (5,000,000) |  |  |  |
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 |  |  |  |  |  |  |
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% |  |  |  |  |  |  |
Proceeds from lines of credit |  |  | $ 200,000,000 |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |
Commitment fee percentage |  |  | 1.50% |  |  |  |  |  |  |
Wells Fargo Bank, National Association | Letter of Credit | Line of Credit | Maximum |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Commitment fee percentage |  |  | 2.25% |  |  |  |  |  |  |
Wells Fargo Bank, National Association | Bridge Loan |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  | $ 10,000,000 |  |  |  |  |  |  |

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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://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 + 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + 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://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 Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: 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(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: 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 Reference 3: 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 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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