Note 7 - Debt, Credit Facility and Leases (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

Schedule of Long-term Debt Instruments [Table Text Block]

	December 31, 2020
	Senior Notes			IQ Notes		Total
Principal	$	475,000		$	37,886	$	512,886
Unamortized discount/premium and issuance costs		(6,462	)		818		(5,644	)
Long-term debt balance	$	468,538		$	38,704	$	507,242

	December 31, 2019
	2021 Notes
Principal	$	506,500
Unamortized discount and issuance costs		(1,771	)
Long-term debt balance	$	504,729

Schedule of Maturities of Long-term Debt [Table Text Block]

	Senior Notes		IQ Notes
2021	$	34,438	$	2,468
2022		34,438		2,468
2023		34,438		2,468
2024		34,438		2,468
2025		34,438		39,173
2026		34,438		—
2027		34,438		—
2028		479,301		—
Total	$	720,367	$	49,045

Schedule of Line of Credit Facilities [Table Text Block]

Interest rates:
Spread over the London Interbank Offered Rate	2.25	-	4.00%
Spread over alternative base rate	1.25	-	3.00%
Standby fee per annum on undrawn amounts	0.5625	-	1.00%
Covenant financial ratios:
Senior leverage ratio (debt secured by liens/EBITDA)	not more than 2.50:1
Leverage ratio (total debt less unencumbered cash/EBITDA)	not more than 4.00:1
Interest coverage ratio (EBITDA/interest expense)	not less than 3.00:1

Finance Lease, Liability, Fiscal Year Maturity [Table Text Block]

Twelve-month period ending December 31,
2021	$	7,053
2022		4,801
2023		3,116
2024		1,849
Total		16,819
Less: imputed interest		(1,054	)
Net finance lease obligation	$	15,765

Lessee, Operating Lease, Liability, Maturity [Table Text Block]

Twelve-month period ending December 31,
2020	$	3,811
2021		2,870
2022		2,521
2023		555
2024		526
More than 5 years		2,339
Total		12,622
Effect of discounting		(1,980	)
Operating lease liability	$	10,642