Note 14 - Long-term Debt (Details Textual) $ / shares in Units, $ in Thousands					1 Months Ended	12 Months Ended
	Nov. 12, 2020	Mar. 26, 2020 USD ($)	Mar. 25, 2020 USD ($)	Oct. 29, 2019 USD ($) $ / shares	Nov. 30, 2019 USD ($) $ / shares	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($) $ / shares	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	May 31, 2018 USD ($)
Long-Term Debt, Maturity, Year One									$ 8,900
Long-Term Debt, Maturity, Year Two									117,700
Long-Term Debt, Maturity, Year Three									231,500
Long-Term Debt, Maturity, Year Four									1,100
Long-Term Debt, Maturity, Year Five									6,800
Long-term Debt, Current Maturities, Total									8,727	$ 8,278
Long-term Debt, Excluding Current Maturities, Total									$ 331,191	330,522
Share Price, Potential Dilutive Effect (in dollars per share) | $ / shares									$ 31.47
Proceeds from Issuance of Warrants									$ 0	0	$ 11,500
Warrants Issued With 2.75% Convertible Notes [Member]
Share Price, Potential Dilutive Effect (in dollars per share) | $ / shares				$ 53.44					$ 53.44
Proceeds from Issuance of Warrants				$ 11,200
London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate									2.76%
The 2.75% Convertible Notes [Member]
Debt Instrument, Convertible, Carrying Amount of Equity Component				37,400	$ 37,400				$ 22,600	$ 29,700
Debt Instrument, Interest Rate, Stated Percentage					2.75%				2.75%	2.75%
Debt Instrument, Face Amount					$ 230,000
Debt Instrument, Interest Rate, Effective Percentage									6.62%
Debt Instrument, Convertible, Conversion Ratio					31.7776
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares					$ 31.47
Debt Instrument, Convertible, Sale Price to Conversion Price, Percentage					130.00%
Debt Instrument, Redemption Price, Percentage Occurence of Fundamental Change					100.00%
Long-term Debt, Gross					$ 192,600				$ 207,400	$ 200,300
Debt Instrument, Convertible, Carrying Amount of Equity Component, Tax Amount				$ 9,500	9,500
Debt Issuance Costs, Net, Total					$ 6,400				3,200	4,300
Amortization of Debt Discount (Premium)									14,800	7,700
Debt Instrument, Unamortized Discount, Total									$ 22,600	29,700
Share Price, Potential Dilutive Effect (in dollars per share) | $ / shares				$ 31.47					$ 31.47
The 2.75% Convertible Notes [Member] | Interest Expense [Member]
Amortization of Debt Discount (Premium)									$ 7,100	6,600
The 2.75% Convertible Notes [Member] | Other (Income) Expense [Member]
Amortization of Debt Discount (Premium)									2,400	2,100
The 2.75% Convertible Notes [Member] | Forecast [Member]
Debt Instrument, Periodic Payment, Interest						$ 6,300	$ 7,500	$ 6,300
The Credit Agreement [Member]
Line of Credit Facility, Maximum Borrowing Capacity												$ 200,000
Line of Credit, Covenant, Minimum Cash Balance												150,000
Debt Instrument, Covenant, Minimum Acquisition Cash Consideration for Leverage Ratio												100,000
Letters of Credit Outstanding, Amount									$ 43,000
Consolidated Leverage Ratio, Actual									2.39
Consolidated Leverage Ratio, Covenant Maximum									3.00
Consolidated Interest Coverage Ratio, Actual									6.69
Debt Instrument, Covenant, Minimum Consolidated Interest Coverage Ratio									4.00
The Credit Agreement [Member] | Forecast [Member]
Debt Instrument, Periodic Payment, Interest							$ 2,400	$ 5,900
The Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate									1.75%
Debt Instrument, Interest Rate, Effective Percentage									2.50%
The Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate									0.0075%
The Credit Agreement [Member] | Base Rate [Member]
Debt Instrument, Basis Spread on Variable Rate									0.75%
Debt Instrument, Interest Rate, Effective Percentage									4.00%
The Credit Agreement [Member] | Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity												350,000
Line of Credit Facility, Remaining Borrowing Capacity									$ 232,000
Proceeds from Lines of Credit, Total									0	50,000
Long-term Line of Credit, Total										0
The Credit Agreement [Member] | Term Loan [Member]
Debt Instrument, Face Amount												$ 150,000
Debt Instrument, Periodic Payment, Principal Balance Percentage												1.25%
Long-term Debt, Current Maturities, Total									7,500	7,500
Long-term Debt, Excluding Current Maturities, Total									$ 116,300	$ 123,800
The Credit Agreement [Member] | Line of Credit [Member] | Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity		$ 275,000	$ 350,000
The Credit Agreement [Member] | Line of Credit [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate	3.00%	3.00%	2.00%