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Note 16 - Accumulated Other Comprehensive Income - Components of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Beginning balance | $ 5,522,147 | $ 5,402,874
Ending balance | 5,502,402 | 5,359,546
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] |  |
Beginning balance | (344) | (975)
Other comprehensive income before reclassifications | (278) | (188)
Amounts reclassified from AOCI |  |
Net current-period other comprehensive income |  | 188
Ending balance | (66) | (787)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] |  |
Beginning balance |  | 6,335
Other comprehensive income before reclassifications |  | (503)
Amounts reclassified from AOCI |  |
Net current-period other comprehensive income |  | 503
Ending balance |  | 6,838
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] |  |
Beginning balance |  | 406
Other comprehensive income before reclassifications |  | (28)
Amounts reclassified from AOCI |  |
Net current-period other comprehensive income |  | 28
Ending balance |  | 434
AOCI Attributable to Parent [Member] |  |
Beginning balance | (1,480) | 5,766
Other comprehensive income before reclassifications |  | (719)
Amounts reclassified from AOCI |  |
Net current-period other comprehensive income |  | 719
Ending balance | $ (66) | $ 6,485

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