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Note 9 - Fair Value Measurements - Long-Term Debt (Details) - Fair Value, Nonrecurring [Member] - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Long-term debt	$ 4,440,782	$ 3,813,956
Reported Value Measurement [Member]
Long-term debt	4,395,097	3,765,931
Estimate of Fair Value Measurement [Member]
Long-term debt	3,943,110	3,962,918
Fair Value, Inputs, Level 2 [Member] | Bank Credit Facility [Member] | Line of Credit [Member]
Long-term debt	1,932,560	1,305,634
Fair Value, Inputs, Level 2 [Member] | Bank Credit Facility [Member] | Line of Credit [Member] | Reported Value Measurement [Member]
Long-term debt	1,918,807	1,290,708
Fair Value, Inputs, Level 2 [Member] | Bank Credit Facility [Member] | Line of Credit [Member] | Estimate of Fair Value Measurement [Member]
Long-term debt	1,809,138	1,308,846
Fair Value, Inputs, Level 1 [Member] | Senior Notes 6.375% Due 2026 [Member] | Senior Notes [Member]
Long-term debt	750,000	750,000
Fair Value, Inputs, Level 1 [Member] | Senior Notes 6.375% Due 2026 [Member] | Senior Notes [Member] | Reported Value Measurement [Member]
Long-term debt	742,060	741,729
Fair Value, Inputs, Level 1 [Member] | Senior Notes 6.375% Due 2026 [Member] | Senior Notes [Member] | Estimate of Fair Value Measurement [Member]
Long-term debt	648,750	806,250
Fair Value, Inputs, Level 1 [Member] | Senior Notes 6.000% Due 2026 [Member] | Senior Notes [Member]
Long-term debt	700,000	700,000
Fair Value, Inputs, Level 1 [Member] | Senior Notes 6.000% Due 2026 [Member] | Senior Notes [Member] | Reported Value Measurement [Member]
Long-term debt	691,105	690,756
Fair Value, Inputs, Level 1 [Member] | Senior Notes 6.000% Due 2026 [Member] | Senior Notes [Member] | Estimate of Fair Value Measurement [Member]
Long-term debt	602,000	750,750
Fair Value, Inputs, Level 1 [Member] | The 4.750% Senior NotesDue December 2027 [Member] | Senior Notes [Member]
Long-term debt	1,000,000	1,000,000
Fair Value, Inputs, Level 1 [Member] | The 4.750% Senior NotesDue December 2027 [Member] | Senior Notes [Member] | Reported Value Measurement [Member]
Long-term debt	984,903	984,416
Fair Value, Inputs, Level 1 [Member] | The 4.750% Senior NotesDue December 2027 [Member] | Senior Notes [Member] | Estimate of Fair Value Measurement [Member]
Long-term debt	825,000	1,038,750
Fair Value, Inputs, Level 3 [Member] | Other Long-Term Debt [Member]
Long-term debt	58,222	58,322
Fair Value, Inputs, Level 3 [Member] | Other Long-Term Debt [Member] | Reported Value Measurement [Member]
Long-term debt	58,222	58,322
Fair Value, Inputs, Level 3 [Member] | Other Long-Term Debt [Member] | Estimate of Fair Value Measurement [Member]
Long-term debt	$ 58,222	$ 58,322

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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611

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