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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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Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

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