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Debt (Details) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) note | Dec. 31, 2016 USD ($)
Line of Credit Facility [Line Items] |  |  |
Total outstanding | $ 1,800,000 | $ 4,721,000 |
2017 Insurance Note Payable | Insurance Notes Payable |  |  |
Line of Credit Facility [Line Items] |  |  |
Number of notes financed | note |  | 3 |
Face amount |  | $ 5,100,000 |
Interest rate |  | 2.90% |
Total outstanding | 1,800,000 | $ 4,700,000 |
Revolving Credit Facility | Credit Facility | Revolving Credit Facility Maturing August 2018 |  |  |
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 | 2,300,000 | 2,800,000 |
Credit facility, amount outstanding | $ 0 | 0 |
Borrowing capacity multiplier | 2.5 |  |
Maximum debt to adjusted EBITDA ratio | 2.50 |  |
Minimum EBITDA to interest expense ratio | 3.0 |  |
Revolving Credit Facility | Credit Facility | Revolving Credit Facility Maturing August 2018 | Minimum |  |  |
Line of Credit Facility [Line Items] |  |  |
Unused capacity, commitment fee | 0.25% |  |
Revolving Credit Facility | Credit Facility | Revolving Credit Facility Maturing August 2018 | Maximum |  |  |
Line of Credit Facility [Line Items] |  |  |
Unused capacity, commitment fee | 0.375% |  |
Revolving Credit Facility | Credit Facility | Revolving Credit Facility Maturing August 2018 | Interest Option 1, Base Rate | Federal Funds Effective Rate |  |  |
Line of Credit Facility [Line Items] |  |  |
Basis spread on variable rate | 0.50% |  |
Revolving Credit Facility | Credit Facility | Revolving Credit Facility Maturing August 2018 | Interest Option 1, Base Rate | Eurodollar |  |  |
Line of Credit Facility [Line Items] |  |  |
Basis spread on variable rate | 1.00% |  |
Revolving Credit Facility | Credit Facility | Revolving Credit Facility Maturing August 2018 | Interest Option 1, Base Rate | Eurodollar | Minimum |  |  |
Line of Credit Facility [Line Items] |  |  |
Additional spread on variable rate | 0.50% |  |
Revolving Credit Facility | Credit Facility | Revolving Credit Facility Maturing August 2018 | Interest Option 1, Base Rate | Eurodollar | Maximum |  |  |
Line of Credit Facility [Line Items] |  |  |
Additional spread on variable rate | 1.50% |  |
Revolving Credit Facility | Credit Facility | Revolving Credit Facility Maturing August 2018 | Interest Option 2, Adjusted Eurodollar Rate | Eurodollar |  |  |
Line of Credit Facility [Line Items] |  |  |
Threshold period for change in interest payment schedule | 3 months |  |
Revolving Credit Facility | Credit Facility | Revolving Credit Facility Maturing August 2018 | Interest Option 2, Adjusted Eurodollar Rate | Eurodollar | Minimum |  |  |
Line of Credit Facility [Line Items] |  |  |
Basis spread on variable rate | 1.50% |  |
Revolving Credit Facility | Credit Facility | Revolving Credit Facility Maturing August 2018 | Interest Option 2, Adjusted Eurodollar Rate | Eurodollar | Maximum |  |  |
Line of Credit Facility [Line Items] |  |  |
Basis spread on variable rate | 2.50% |  |
Letter of Credit | Credit Facility | Revolving Credit Facility Maturing August 2018 |  |  |
Line of Credit Facility [Line Items] |  |  |
Maximum borrowing capacity limit | $ 20,000,000.0 |  |
Swing Line Loan | Credit Facility | Revolving Credit Facility Maturing August 2018 |  |  |
Line of Credit Facility [Line Items] |  |  |
Maximum borrowing capacity limit | 10,000,000.0 |  |
Citibank Credit Facility | Credit Facility |  |  |
Line of Credit Facility [Line Items] |  |  |
Maximum borrowing capacity limit |  |  | $ 6,000,000.0
Letters of credit, amount outstanding | $ 4,900,000 | $ 2,600,000 |
Expiration period |  |  | 3 years
Fixed interest rate, short-term |  |  | 1.25%
Fixed interest rate, long-term |  |  | 1.50%

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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 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 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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