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Fair Value Measurements Fair Value Measurements (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Sep. 09, 2020	Dec. 31, 2019
Convertible subordinated notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, fair value	$ 3,700
Principal amount	2,559	$ 2,600	$ 6,319
Senior Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, fair value	427,900
Notes payable, other | Acquisition Debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Principal amount	5,509		6,964
Line of Credit | Revolving Credit Facility, Secured, Floating Rate | Revolving Credit Facility
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Principal amount	$ 47,200		$ 83,800

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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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