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v3.19.3.a.u2

5. Notes Payable and Long-Term Debt (Details) - USD ($) | Dec. 31, 2019 | Apr. 30, 2019 | Dec. 31, 2018 | Dec. 31, 2010
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Debt and Lease Obligation | $ 439,800,000 |  | $ 439,400,000 |
Other Long-term Debt, Current | 426,200,000 |  | 500,000 |
Long-term Debt and Lease Obligation | 13,579,000 |  | 438,937,000 |
Maturities of Long-term Debt [Abstract] |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months | 426,800,000 |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Two | 1,600,000 |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Three | 1,500,000 |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Four | 400,000 |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Five | 400,000 |  |  |
Long-term Debt, Maturities, Repayments of Principal after Year Five | 9,700,000 |  |  |
Line of Credit Facility, Remaining Borrowing Capacity | 207,500,000 |  |  |
Letters of Credit Outstanding, Amount | 4,200,000 |  |  |
Performance Guarantee [Member] |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |
Letters of Credit Outstanding, Amount | 4,200,000 |  |  |
Unsecured Debt [Member] | Senior Notes 4.875% due 2020 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured Debt | 425,000,000.0 |  | 425,000,000.0 |
Long-term debt | 424,400,000 |  | 423,700,000 | $ 422,600,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | 600,000 |  | 1,300,000 |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  | 4.946%
Face amount of debt sold |  |  |  | $ 425,000,000.0
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 4.875%
Finance Lease Obligations [Member] | Finance Leases and Other Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Other Long-term Debt | 15,400,000 |  | 0 |
Capital Lease Obligations [Member] | Capital Leases and Other Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt and Lease Obligation, Including Current Maturities | 0 |  | $ 15,700,000 |
Line of Credit [Member] |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 200,000,000.0 |  |
Long-term Line of Credit | $ 0 |  |  |
Line of Credit Facility, Interest Rate at Period End | 3.035% |  |  |
Letters of Credit Outstanding, Amount | $ 200,000 |  |  |

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