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v3.19.1

Debt and Credit Arrangements - Senior Secured Revolving Credit Facility (Details) | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($) | Mar. 31, 2020 | Dec. 31, 2018 USD ($) | Oct. 26, 2018 USD ($) | Aug. 01, 2018
Debt Instrument |  |  |  |  |  |
Financing costs amortization | $ 400,000 | $ 300,000 |  |  |  |
Senior Secured Revolving Credit Facility | Revolving Credit Facility |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Debt instrument, term | 5 years |  |  |  |  |
Debt instrument stated interest rate (percent) | 1.00% |  |  |  |  |
Line of credit fronting fee (as a percentage) | 0.125% |  |  |  |  |
Maximum percentage of capital stock guaranteed by company | 65.00% |  |  |  |  |
Senior Secured Revolving Credit Facility | Revolving Credit Facility | Adjusted Base Rate |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Debt instrument variable interest rate ( percent) | 1.00% |  |  |  |  |
Senior secured revolving credit facility due November 2022 | Swing line loan |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Interest expense |  | 2,500,000 |  |  |  |
Senior secured revolving credit facility due November 2022 | Revolving Credit Facility |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Line of credit fronting fee (as a percentage) | 0.125% |  |  |  |  |
Senior secured revolving credit facility due November 2022 | Revolving Credit Facility |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Debt instrument, term | 5 years |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 550,000,000.0 |
Debt issuance costs | $ 3,200,000 |  |  |  |  |
Unamortized debt issuance costs | 2,900,000 |  |  |  |  |
Financing costs amortization | 200,000 | 100,000 |  |  |  |
Long term debt | $ 318,000,000 |  |  | $ 329,300,000 |  |
Weighted average interest rate (percent) | 3.90% |  |  |  |  |
Letters of credit outstanding | $ 49,400,000 |  |  |  |  |
Line of credit remaining borrowing amount | 182,600,000 |  |  |  |  |
Interest expense | $ 3,200,000 |  |  |  |  |
Senior secured revolving credit facility due November 2022 | Revolving Credit Facility | Minimum |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Line of credit commitment fee (as a percentage) | 0.20% |  |  |  |  |
Line of credit participation fee (as a percentage) | 1.50% |  |  |  |  |
Senior secured revolving credit facility due November 2022 | Revolving Credit Facility | Maximum |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Line of credit commitment fee (as a percentage) | 0.375% |  |  |  |  |
Line of credit participation fee (as a percentage) | 2.50% |  |  |  |  |
Senior secured revolving credit facility due November 2022 | Revolving Credit Facility Sub-limit - Swingline |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Maximum borrowing capacity | $ 25,000,000.0 |  |  |  |  |
Senior secured revolving credit facility due November 2022 | Revolving Credit Facility Sub-limit - Letters of Credit |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Maximum borrowing capacity | 100,000,000.0 |  |  |  |  |
Senior secured revolving credit facility due November 2022 | Revolving Credit Facility Sub-limit - Foreign Currency |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Maximum borrowing capacity | 250,000,000.0 |  |  |  |  |
Senior secured revolving credit facility due November 2022 | Revolving Credit Facility Sub-limit - Foreign Borrower |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Maximum borrowing capacity | 250,000,000.0 |  |  |  |  |
Senior secured revolving credit facility due November 2022 | Revolving Credit Facility Sub-limit - Expansion Option |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Maximum borrowing capacity | $ 225,000,000.0 |  |  |  |  |
Convertible Notes, Due 2018 | Convertible Debt |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Debt instrument stated interest rate (percent) |  |  |  |  |  | 2.00%
Leverage ratio | 4.50 |  |  |  |  |
Interest expense |  | $ 1,400,000 |  |  |  |
Convertible Notes, Due 2018 | Convertible Debt | Minimum |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Interest to EBITDA | 3.0 |  |  |  |  |
Convertible Notes, Due 2018 | Convertible Debt | Maximum |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Leverage ratio | 4.00 |  |  |  |  |
Convertible Notes, Due 2018 | Convertible Debt | Forecasted |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |
Leverage ratio |  |  | 3.50 |  |  |

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