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5. Notes Payable and Long-Term Debt (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Apr. 30, 2019	Dec. 31, 2010
Debt Instrument [Line Items]
Debt and Lease Obligation	$ 14,100,000	$ 439,800,000
Other Long-term Debt, Current	1,800,000	426,200,000
Long-term Debt and Lease Obligation	12,258,000	13,579,000
Maturities of Long-term Debt [Abstract]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	1,800,000
Long-term Debt, Maturities, Repayments of Principal in Year Two	1,800,000
Long-term Debt, Maturities, Repayments of Principal in Year Three	400,000
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	9,300,000
Line of Credit Facility, Remaining Borrowing Capacity	207,200,000
Letters of Credit Outstanding, Amount	4,900,000
Performance Guarantee [Member]
Maturities of Long-term Debt [Abstract]
Letters of Credit Outstanding, Amount	4,900,000
Unsecured Debt [Member] | Senior Notes 4.875% due 2020 [Member]
Debt Instrument [Line Items]
Unsecured Debt	0	425,000,000.0
Long-term debt	0	424,400,000		$ 422,600,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	$ 0	600,000
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%
Maturities of Long-term Debt [Abstract]
Debt Instrument, Redemption Price, Percentage	100.00%
Finance Lease Obligations [Member] | Finance Leases and Other Debt [Member]
Debt Instrument [Line Items]
Other Long-term Debt	$ 14,100,000	$ 15,400,000
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	1.375%
Letters of Credit Outstanding, Amount	$ 200,000

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