Note 8 - Fair Value Measurements - Long-term Debt (Details) - Fair Value, Nonrecurring [Member] - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Long-term debt	$ 2,949,745	$ 3,069,393
Reported Value Measurement [Member]
Long-term debt	2,908,864	3,031,594
Estimate of Fair Value Measurement [Member]
Long-term debt	2,707,486	3,128,058
Fair Value, Inputs, Level 2 [Member] | Bank Credit Facility [Member] | Line of Credit [Member]
Long-term debt	1,049,000	867,897
Fair Value, Inputs, Level 2 [Member] | Bank Credit Facility [Member] | Line of Credit [Member] | Reported Value Measurement [Member]
Long-term debt	1,030,966	859,106
Fair Value, Inputs, Level 2 [Member] | Bank Credit Facility [Member] | Line of Credit [Member] | Estimate of Fair Value Measurement [Member]
Long-term debt	1,045,741	866,812
Fair Value, Inputs, Level 1 [Member] | Senior Note 4.750% Due 2027 [Member] | Senior Notes [Member]
Long-term debt	1,000,000	1,000,000
Fair Value, Inputs, Level 1 [Member] | Senior Note 4.750% Due 2027 [Member] | Senior Notes [Member] | Reported Value Measurement [Member]
Long-term debt	989,286	988,312
Fair Value, Inputs, Level 1 [Member] | Senior Note 4.750% Due 2027 [Member] | Senior Notes [Member] | Estimate of Fair Value Measurement [Member]
Long-term debt	905,000	1,023,750
Fair Value, Inputs, Level 1 [Member] | Senior Note 4750 Due 2031 Member | Senior Notes [Member]
Long-term debt	900,000	900,000
Fair Value, Inputs, Level 1 [Member] | Senior Note 4750 Due 2031 Member | Senior Notes [Member] | Reported Value Measurement [Member]
Long-term debt	887,867	886,746
Fair Value, Inputs, Level 1 [Member] | Senior Note 4750 Due 2031 Member | Senior Notes [Member] | Estimate of Fair Value Measurement [Member]
Long-term debt	756,000	915,750
Fair Value, Inputs, Level 1 [Member] | Senior Note 8.625% Due 2025 [Member] | Senior Notes [Member]
Long-term debt		300,000
Fair Value, Inputs, Level 1 [Member] | Senior Note 8.625% Due 2025 [Member] | Senior Notes [Member] | Reported Value Measurement [Member]
Long-term debt		295,934
Fair Value, Inputs, Level 1 [Member] | Senior Note 8.625% Due 2025 [Member] | Senior Notes [Member] | Estimate of Fair Value Measurement [Member]
Long-term debt		320,250
Fair Value, Inputs, Level 3 [Member] | Other Long-Term Debt [Member]
Long-term debt	745	1,496
Fair Value, Inputs, Level 3 [Member] | Other Long-Term Debt [Member] | Reported Value Measurement [Member]
Long-term debt	745	1,496
Fair Value, Inputs, Level 3 [Member] | Other Long-Term Debt [Member] | Estimate of Fair Value Measurement [Member]
Long-term debt	$ 745	$ 1,496