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5. Notes Payable and Long-Term Debt (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2014 | Dec. 31, 2010
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Debt and Capital Lease Obligations | $ 439,400 | $ 435,000 |  |
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal Remainder of Fiscal Year | 500 | 400 |  |
Long-term Debt and Capital Lease Obligations | 438,937 | 434,581 |  |
Maturities of Long-term Debt [Abstract] |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months | 500 |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Two | 426,600 |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Three | 1,700 |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Four | 1,600 |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Five | 400 |  |  |
Long-term Debt, Maturities, Repayments of Principal after Year Five | 9,900 |  |  |
Line of Credit Facility, Remaining Borrowing Capacity | 208,200 |  |  |
Letters of Credit Outstanding, Amount | 3,100 |  |  |
Performance Guarantee [Member] |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |
Letters of Credit Outstanding, Amount | 3,100 |  |  |
Unsecured Debt [Member] | Senior Notes 4.875% due 2020 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured Debt | 425,000 | 425,000 |  |
Long-term debt | 423,700 | 423,100 |  | $ 422,600
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | 1,300 | 1,900 |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  | 4.946%
Face amount of debt sold |  |  |  | $ 425,000
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 4.875%
Capital Lease Obligations [Member] | Capital Leases and Other Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt and Capital Lease Obligations, Including Current Maturities | 15,700 | 11,900 |  |
Line of Credit [Member] |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | $ 200,000 |
Long-term Line of Credit | $ 0 |  |  |
Line of Credit Facility, Interest Rate at Period End | 3.925% |  |  |
Standby Letters of Credit [Member] |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |
Letters of Credit Outstanding, Amount | $ 200 | $ 500 |  |

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