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Note 15 - Accumulated Other Comprehensive Income ("AOCI") - Components of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2017 | Jun. 30, 2016
Balance at the end of the year | $ 5,425,602 | $ 5,444,685
Balance at the beginning of the year | 5,402,874 | 5,181,951
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] |  |
Other comprehensive income before reclassifications | 1,721 | 2,354
Amounts reclassified from AOCI |  |
Net current-period other comprehensive income | 1,721 | 2,354
Balance at the end of the year | 8,056 | 8,970
Balance at the beginning of the year | 6,335 | 6,616
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] |  |
Other comprehensive income before reclassifications | (1,619) | (33)
Amounts reclassified from AOCI |  |
Net current-period other comprehensive income | (1,619) | (33)
Balance at the end of the year | (1,213) | 365
Balance at the beginning of the year | 406 | 398
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |  |
Other comprehensive income before reclassifications | 205 | (759)
Amounts reclassified from AOCI |  |
Net current-period other comprehensive income | 205 | (759)
Balance at the end of the year | (770) | (2,185)
Balance at the beginning of the year | (975) | (1,426)
AOCI Attributable to Parent [Member] |  |
Other comprehensive income before reclassifications | 307 | 1,562
Amounts reclassified from AOCI |  |
Net current-period other comprehensive income | 307 | 1,562
Balance at the end of the year | 6,073 | 7,150
Balance at the beginning of the year | $ 5,766 | $ 5,588

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- Definition Amount after tax and reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669619-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669625-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84158357&loc=d3e1436-108581 + Details
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