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Note 12 - Borrowings and Financing Activities - Senior Notes (Details) - Senior Notes - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2020 | Jun. 30, 2019 | Sep. 30, 2017 | Dec. 31, 2020
Senior Notes Due 2024 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount |  |  | $ 450,000 |
Proceeds from Issuance of Long-term Debt |  |  | $ 442,200 |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 4.50% |
Senior Notes Due 2027 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount |  | $ 450,000 |  |
Proceeds from Issuance of Long-term Debt |  | $ 442,200 |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.875% |  |
Senior Notes Due 2024 and 2027 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Percent of Stock With Ordinary Voting Rights That Company Must Retain In Order To Make Any Capital Stock Transactions |  |  |  | 80.00%
Senior Notes Due 2025 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount | $ 525,000 |  |  |
Proceeds from Issuance of Long-term Debt | $ 515,600 |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.625% |  |  |
Senior Notes Due 2024, 2025 and 2027 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Redemption Price, Percentage |  |  |  | 100.00%
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 0.50%

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