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Debt (Details Textual) - USD ($)	May 28, 2020	Jun. 30, 2021	Dec. 31, 2020
Debt [Line Items]
Amount outstanding under the line of credit		$ 88,602,000	$ 0
Prime Rate | Minimum
Debt [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.75%
Prime Rate | Maximum
Debt [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.25%
Non-Prime Rate | Minimum
Debt [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.50%
Non-Prime Rate | Maximum
Debt [Line Items]
Debt Instrument, Basis Spread on Variable Rate	3.00%
6.50% Notes due 2024
Debt [Line Items]
Interest rate, stated percentage		7.50%
Senior Notes | 6.50% Notes due 2024 | Fair Value, Inputs, Level 1
Debt [Line Items]
Long-term Debt		$ 870,256,000	870,256,000
Line of Credit [Member]
Debt [Line Items]
Maximum borrowing capacity		211,500,000
Letter of Credit
Debt [Line Items]
Maximum borrowing capacity		$ 19,533,000	$ 18,651,000

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Contractual interest rate for funds borrowed, under the debt agreement.

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-Topic 210
-SubTopic 10
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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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