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Note 15 - Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Balance | $ 1,461,277 | $ 1,462,240 | $ 1,329,300
Change, net of tax | (17,807) | 11,229 | (1,971)
Balance | 1,690,963 | 1,461,277 | 1,462,240
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] |  |  |
Balance | 3,719 | 1,454 | (1,159)
Change, net of tax | (2,443) | 2,265 | 2,613
Impact of Adoption of Accounting Standard Update | (1,300) |  |
Balance | (13) | 3,719 | 1,454
Balance, tax | 1,791 | 627 | 631
Change, tax | (1,791) | 1,164 | (4)
Balance, tax |  | 1,791 | 627
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] | Accounting Standards Update 2016-01 [Member] |  |  |
Impact of Adoption of Accounting Standard Update | (1,289) |  |
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |  |  |
Balance | 5,030 | (5,260) |
Change, net of tax | (13,814) | 10,290 | (5,260)
Impact of Adoption of Accounting Standard Update |  |  |
Balance | (8,784) | 5,030 | (5,260)
Balance, tax |  |  |
Change, tax |  |  |
Balance, tax |  |  |
Accumulated Defined Benefit Plans Adjustment, Net Transition Attributable to Parent [Member] |  |  |
Balance | (32,122) | (30,796) | (31,472)
Change, net of tax | (1,550) | (1,326) | 676
Impact of Adoption of Accounting Standard Update |  |  |
Balance | (33,672) | (32,122) | (30,796)
Balance, tax | 10,120 | 10,120 | 10,630
Change, tax | 2,455 |  | (510)
Balance, tax | 12,575 | 10,120 | 10,120
AOCI Attributable to Parent [Member] |  |  |
Balance | (23,373) | (34,602) | (32,631)
Change, net of tax | (17,807) | 11,229 | (1,971)
Impact of Adoption of Accounting Standard Update | (1,289) |  |
Balance | (42,469) | (23,373) | (34,602)
Balance, tax | 11,911 | 10,747 | 11,261
Change, tax | 664 | 1,164 | (514)
Balance, tax | $ 12,575 | $ 11,911 | $ 10,747

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- Definition Amount after tax of other comprehensive income (loss) attributable to parent entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669625-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4569643-111683 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669619-108580 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4569616-111683 + Details
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