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Note 11 - Long-Term Debt Schedule of Convertible Debt (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jan. 27, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Net carrying amount |  |  | $ 1,026,806 |  |  | $ 1,026,806 |  | $ 1,069,537
Convertible Senior Notes Due 2017 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayments of Convertible Debt |  |  |  | $ 31,600 |  |  |  |
Debt Instrument, Convertible, Carrying Amount of Equity Component |  |  | 100 |  |  | 100 |  | 5,000
Net carrying amount |  |  | 521 |  |  | 521 |  | 20,947
Convertible Senior Notes Due 2019 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayments of Convertible Debt |  | $ 110,100 |  |  |  |  |  |
Debt Instrument, Convertible, Carrying Amount of Equity Component |  |  |  |  |  |  |  | 13,100
Net carrying amount |  |  | 0 |  |  | 0 |  | 62,013
Convertible Debt | Convertible Senior Notes Due 2017 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal amount of convertible debt in liabilities |  |  | 526 |  |  | 526 |  | 22,233
Less: Debt discount, net (1) | [1] |  | (5) |  |  | (5) |  | (1,221)
Less: Debt issuance costs (1) | [1] |  | 0 |  |  | 0 |  | (65)
Net carrying amount |  |  | 521 |  |  | 521 |  | 20,947
Contractual interest expense (benefit) | [2] |  | 4 |  | $ 166 | 312 | $ 705 |
Amortization of debt issuance costs |  |  | 0 |  | 17 | 32 | 71 |
Amortization of debt discount |  |  | 10 |  | 322 | 615 | 1,344 |
Total interest expense (benefit) | [2] |  | 14 |  | 505 | 959 | 2,120 |
Convertible Debt | Convertible Senior Notes Due 2019 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal amount of convertible debt in liabilities |  |  | 0 |  |  | 0 |  | 68,024
Less: Debt discount, net (1) | [1] |  | 0 |  |  | 0 |  | (5,461)
Less: Debt issuance costs (1) | [1] |  | 0 |  |  | 0 |  | (550)
Net carrying amount |  |  | 0 |  |  | 0 |  | $ 62,013
Contractual interest expense (benefit) | [3] |  | 0 |  | 493 | (510) | 3,043 |
Amortization of debt issuance costs |  |  | 0 |  | 74 | 16 | 447 |
Amortization of debt discount |  |  | 0 |  | 737 | 163 | 4,434 |
Total interest expense (benefit) | [3] |  | $ 0 |  | $ 1,304 | $ (331) | $ 7,924 |
[1] | Included within long-term debt and is being amortized over the life of the convertible notes.
[2] | Interest expense (benefit) represents expense incurred, net of adjustments to accruals previously recorded.
[3] | Interest expense (benefit) represents expense incurred, net of adjustments to accruals previously recorded.

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- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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