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v3.6.0.2

Debt (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Lines of credit | Credit Facilities |  |
Line of Credit Facility [Line Items] |  |
Maximum additional borrowing capacity | $ 150,000,000.0 |
Letters of credit, amount outstanding | $ 3,700,000 | $ 4,700,000
Lines of credit | Credit Facilities | Minimum |  |
Line of Credit Facility [Line Items] |  |
Unused capacity, commitment fee (percent) | 0.25% |
Lines of credit | Credit Facilities | Maximum |  |
Line of Credit Facility [Line Items] |  |
Unused capacity, commitment fee (percent) | 0.375% |
Lines of credit | Revolving Credit Facility | Credit Facilities |  |
Line of Credit Facility [Line Items] |  |
Total consolidated funded debt to adjusted EBITDA ratio, maximum (percent) (not more than) | 2.50 |
EBITDA to interest expense ratio, minimum (percent) (not less than) | 3.0 |
Lines of credit | Revolving Credit Facility | Credit Facilities | Federal Funds Effective Rate |  |
Line of Credit Facility [Line Items] |  |
Basis spread on variable rate (percent) | 0.50% |
Lines of credit | Revolving Credit Facility | Credit Facilities | Eurodollar |  |
Line of Credit Facility [Line Items] |  |
Fix spread on variable rate (percent) | 1.00% |
Lines of credit | Revolving Credit Facility | Credit Facilities | Eurodollar | Minimum |  |
Line of Credit Facility [Line Items] |  |
Basis spread on variable rate (percent) | 1.50% |
Variable spread on variable rate (percent) | 0.50% |
Lines of credit | Revolving Credit Facility | Credit Facilities | Eurodollar | Maximum |  |
Line of Credit Facility [Line Items] |  |
Basis spread on variable rate (percent) | 2.50% |
Variable spread on variable rate (percent) | 1.50% |
Lines of credit | Revolving Credit Facility | Revolving Credit Facility Maturing August 2018 |  |
Line of Credit Facility [Line Items] |  |
Maximum borrowing capacity | $ 100,000,000.0 |
Line of credit, remaining borrowing capacity | 50,000,000 |
Lines of credit | Swing Line Loan | Revolving Credit Facility Maturing August 2018 |  |
Line of Credit Facility [Line Items] |  |
Maximum borrowing capacity | 10,000,000.0 |
Lines of credit | Letter of Credit | Revolving Credit Facility Maturing August 2018 |  |
Line of Credit Facility [Line Items] |  |
Maximum borrowing capacity | 20,000,000.0 |
Lines of credit | Citibank Credit Facility |  |
Line of Credit Facility [Line Items] |  |
Maximum borrowing capacity | 6,000,000.0 |
Letters of credit, amount outstanding | $ 2,200,000 |
Line of credit, expiration period (in years) | 3 years |
Line of credit, fixed interest rate short-term (percent) | 1.25% |
Line of credit, fixed interest rate long-term (percent) | 1.50% |
Insurance Notes Payable | AFCO Credit Corporation Insurance Note Payable |  |
Line of Credit Facility [Line Items] |  |
Debt instrument, face amount |  | $ 7,600,000.0
Debt instrument, interest rate (percent) |  | 1.90%
Total outstanding | $ 0 | $ 6,900,000

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