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Note 13 - Notes Payable (Details Textual) CAD in Millions |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 26, 2016 USD ($) | Aug. 26, 2016 CAD | Feb. 24, 2017 USD ($) | Jan. 31, 2017 USD ($) | Nov. 30, 2016 USD ($) | Aug. 31, 2016 USD ($) | Jan. 31, 2015 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Gain (Loss) on Extinguishment of Debt |  |  |  |  |  |  |  |  |  | $ (45,674,000) |  |
Debt Covenants Dividend Payment Restriction Maximum Payment |  |  |  |  |  |  |  |  |  | 26,000,000 |  |
Line of Credit Facility Sub-limit |  |  |  |  |  |  |  |  |  | 500,000,000 |  |
Long-term Line of Credit |  |  |  |  |  |  |  |  |  | 25,000,000 |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  |  |  |  |  |  |  |  |  | 1,750,000,000 |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  | 2,250,000,000 |  |
Letter of Credit [Member] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  |  |  |  |  |  |  |  |  | 1,750,000,000 |  |
Long-term Line of Credit |  |  |  |  |  |  |  |  |  | $ 700,000 |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility Sub-limit |  |  |  | $ 500,000,000 |  |  |  |  |  |  |  |
Subsequent Event [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  |  |  | 2,250,000,000 |  |  |  |  |  |  |  |
Subsequent Event [Member] | Revolving Credit Facility [Member] | Credit Facility Accordion Feature [Member] |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | $ 2,750,000,000 |  |  |  |  |  |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Subsequent Event [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 0.875% |  |  |  |  |  |  |  |
Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  | 1.60% | 1.37% |
Repayments of Long-term Debt |  |  |  |  |  | $ 400,000,000 |  | $ 400,000,000 |  |  |  |
Unsecured Debt |  |  |  |  |  |  |  | $ 650,000,000 |  | $ 250,000,000 |  |
Term Loan [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  |  | $ 250,000,000 |  |  |  | $ 250,000,000 |  |  |
Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  |  |  |  | 0.95% |  | 1.05%
Line of Credit [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  | 1.67% | 1.35% |
Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  |  |  |  |  |  | 0.925% |  |
Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt, Weighted Average Interest Rate |  |  |  |  |  |  |  |  |  | 3.58% |  |
Debt Issuance Costs, Net |  |  |  |  |  |  |  |  |  | $ 47,700,000 |  |
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months |  |  |  |  |  |  |  |  |  | 250,000,000 |  |
Long-term Debt, Maturities, Repayments of Principal in Year Two |  |  |  |  |  |  |  |  |  | 325,000,000 |  |
Long-term Debt, Maturities, Repayments of Principal in Year Three |  |  |  |  |  |  |  |  |  | 300,000,000 |  |
Long-term Debt, Maturities, Repayments of Principal in Year Four |  |  |  |  |  |  |  |  |  | 0 |  |
Long-term Debt, Maturities, Repayments of Principal in Year Five |  |  |  |  |  |  |  |  |  | 500,000,000 |  |
Long-term Debt, Maturities, Repayments of Principal after Year Five |  |  |  |  |  |  |  |  |  | 2,600,000,000 |  |
Gain (Loss) on Extinguishment of Debt |  |  |  |  |  |  |  |  |  | $ (10,200,000) |  |
Canadian Notes Payable, Mature in April 2018 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.99% | 5.99% |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt | CAD |  |  | CAD 150.0 |  |  |  |  |  |  |  |  |
Canadian Notes Payable, Mature in August 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 3.855% | 3.855% |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt | CAD |  |  | CAD 200.0 |  |  |  |  |  |  |  |  |
Canadian Notes Payable [Member] |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt | [1] |  |  |  |  |  | $ 270,900,000 |  |  |  |  |
Gain (Loss) on Extinguishment of Debt |  | $ (26,300,000) | CAD (34.1) |  |  |  |  |  |  |  |  |
[1] | On August 26, 2016, the redemption date, the Company repaid (i) its Canadian denominated ("CAD") $150.0 million 5.99% notes, which were scheduled to mature in April 2018 and (ii) its CAD $200.0 million 3.855% notes, which were scheduled to mature in August 2020. The Company recorded aggregate early extinguishment of debt charges of CAD $34.1 million (USD $26.3 million) resulting from the early repayment of these notes.

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