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Note 23 - Impact of Recently Issued Accounting Standards (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent | $ 52,394 | $ 82,252
Deferred Tax Liabilities, Net, Noncurrent | 18,579 | 14,582
Operating Income (Loss) | 166,827 | 146,173
Revenues | 2,275,362 | $ 1,896,724
Accounting Standards Update 2015-17 [Member] |  |
Deferred Tax Assets, Net of Valuation Allowance, Current | (18,314) |
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent | 13,806 |
Deferred Tax Liabilities, Net, Current | (376) |
Deferred Tax Liabilities, Net, Noncurrent | (4,132) |
Accounting Standards Update 2016-09 [Member] | Retained Earnings [Member] |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | 476 |
Accounting Standards Update 2014-09 [Member] |  |
Deferred Revenue, Revenue Recognized | 14,000 |
Operating Income (Loss) | (2,000) |
Revenues | $ 146,000 |

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