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Debt and Credit Arrangements - Senior Secured Revolving Credit Facility and Term Loan (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 14, 2019 | Jul. 31, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Debt Instrument |  |  |  |  |  |  |
Payments for debt issuance costs |  |  |  |  | $ 13,600,000 | $ 200,000 |
Revolving Credit Facility |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Interest expense |  |  | $ 5,600,000 | $ 2,900,000 | 11,400,000 | 8,000,000.0 |
Financing costs amortization |  |  | $ 800,000 | 100,000 | $ 1,200,000 | 400,000 |
Revolving Credit Facility | Credit Facilities 2019 |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Maximum percentage of capital stock guaranteed by company |  |  | 65.00% |  | 65.00% |  |
Unamortized debt issuance costs |  |  | $ 5,800,000 |  | $ 5,800,000 |  |
Revolving Credit Facility | Credit Facilities 2019 | Adjusted Base Rate | Minimum |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Debt instrument variable interest rate (percent) | 0.25% |  |  |  |  |  |
Revolving Credit Facility | Credit Facilities 2019 | Adjusted Base Rate | Maximum |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Debt instrument variable interest rate (percent) | 1.25% |  |  |  |  |  |
Revolving Credit Facility | Credit Facilities 2019 | LIBOR | Minimum |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Debt instrument variable interest rate (percent) | 1.25% |  |  |  |  |  |
Revolving Credit Facility | Credit Facilities 2019 | LIBOR | Maximum |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Debt instrument variable interest rate (percent) | 2.25% |  |  |  |  |  |
Revolving Credit Facility | Term loan |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Maximum borrowing capacity | $ 450,000,000.0 |  |  |  |  |  |
Long term debt |  |  | $ 450,000,000.0 |  | $ 450,000,000.0 |  |
Debt instrument stated interest rate (percent) |  |  | 3.29% |  | 3.29% |  |
Debt instrument percentage of principal due annually, through year two (percent) |  |  | 2.50% |  | 2.50% |  |
Debt instrument percentage of principal due annually, year three (percent) |  |  | 5.00% |  | 5.00% |  |
Debt instrument percentage of principal due annually, year four (percent) |  |  | 7.50% |  | 7.50% |  |
Debt instrument percentage of principal due annually, year five and after (percent) |  |  | 10.00% |  | 10.00% |  |
Ticking fee |  |  | $ 100,000 |  | $ 100,000 |  |
Interest expense |  |  | 4,600,000 |  | 4,600,000 |  |
Debt issuance costs |  |  | 6,100,000 |  | $ 6,100,000 |  |
Debt instrument, term |  |  |  |  | 5 years |  |
Revolving Credit Facility | Term loan | Minimum |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Line of credit commitment fee (percent) |  | 0.20% |  |  |  |  |
Revolving Credit Facility | Term loan | Maximum |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Line of credit commitment fee (percent) |  | 0.35% |  |  |  |  |
Revolving Credit Facility | Senior secured revolving credit facility |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Maximum borrowing capacity | $ 550,000,000.0 |  |  |  |  |  |
Long term debt |  |  | 149,800,000 |  | $ 149,800,000 |  |
Interest expense |  |  | $ 1,000,000.0 |  | $ 6,800,000 |  |
Line of credit fronting fee (percent) |  |  | 0.125% |  | 0.125% |  |
Debt instrument, term |  |  |  |  | 5 years |  |
Payments for debt issuance costs |  |  |  |  | $ 7,500,000 |  |
Unamortized debt issuance costs |  |  | $ 9,500,000 |  | $ 9,500,000 |  |
Weighted average interest rate (percent) |  |  | 1.99% |  | 1.99% |  |
Letters of credit outstanding |  |  | $ 61,200,000 |  | $ 61,200,000 |  |
Line of credit remaining borrowing amount |  |  | 339,000,000.0 |  | $ 339,000,000.0 |  |
Revolving Credit Facility | Senior secured revolving credit facility | Minimum |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Line of credit commitment fee (percent) | 0.20% |  |  |  |  |  |
Line of credit participation fee percent) |  |  |  |  | 1.25% |  |
Revolving Credit Facility | Senior secured revolving credit facility | Maximum |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Line of credit commitment fee (percent) | 0.35% |  |  |  |  |  |
Line of credit participation fee percent) |  |  |  |  | 2.25% |  |
Revolving Credit Facility | Senior secured revolving credit facility due 2022 |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Maximum borrowing capacity | $ 550,000,000.0 |  |  |  |  |  |
Long term debt |  |  |  |  |  |  | $ 329,300,000
Interest expense |  |  |  | $ 2,900,000 |  | $ 8,000,000.0 |
Unamortized debt issuance costs |  |  | $ 2,500,000 |  | $ 2,500,000 |  |
Financing costs amortization |  |  |  |  | $ 200,000 |  |
Revolving Credit Facility Sub-limit - Letters of Credit | Senior secured revolving credit facility |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Maximum borrowing capacity | 100,000,000.0 |  |  |  |  |  |
Revolving Credit Facility Sub-limit - Discretionary Letters of Credit | Senior secured revolving credit facility |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Maximum borrowing capacity | 250,000,000.0 |  |  |  |  |  |
Revolving Credit Facility Sub-limit - Swingline | Senior secured revolving credit facility |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |
Maximum borrowing capacity | $ 50,000,000.0 |  |  |  |  |  |

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