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Note 15 - Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan [Table Text Block] |
|  | FISCAL YEAR |
|  | 20 17 |  |  | 20 16 |
|  | (in thousands) |
Change in benefit obligation |  |  |  |  |  |  |  |
Benefit obligation, beginning of year |  | $ | 277,813 |  |  | $ | 243,717 |
Service cost |  |  | 1,628 |  |  |  | 1,032 |
Interest cost |  |  | 5,559 |  |  |  | 6,580 |
Benefits and expenses paid |  |  | (10,267 | ) |  |  | (8,551 | )
Actuarial loss (gain) |  |  | 13,351 |  |  |  | 73,600 |
Member contributions |  |  | 262 |  |  |  | 225 |
Currency translation adjustment |  |  | 32,202 |  |  |  | (38,790 | )
Benefit obligation, end of year |  | $ | 320,548 |  |  | $ | 277,813 |
|  | FISCAL YEAR |
|  | 2017 |  |  | 2016 |
|  | (in thousands) |
Change in plan assets |  |  |  |  |  |  |  |
Plan assets, beginning of year |  | $ | 258,365 |  |  | $ | 239,281 |
Actual return on assets |  |  | 25,691 |  |  |  | 59,364 |
Company contributions |  |  | 2,812 |  |  |  | 4,991 |
Benefits paid |  |  | (10,267 | ) |  |  | (8,552 | )
Currency translation adjustment |  |  | 30,565 |  |  |  | (36,719 | )
Plan assets, end of year |  | $ | 307,166 |  |  | $ | 258,365 |
Reconciliation to balance sheet |  |  |  |  |  |  |  |
Funded status benefit asset/(liability) |  | $ | (13,382 | ) |  | $ | (19,448 | )
Net amount recognized |  | $ | (13,382 | ) |  | $ | (19,448 | )
Amounts recognized in accumulated other comprehensive income (after tax) |  |  |  |  |  |  |  |
Unrecognized actuarial loss |  | $ | 48,443 |  |  | $ | 49,547 |
Unamortized prior service costs |  |  | (471 | ) |  |  | (311 | )
Total amount recognized |  | $ | 47,972 |  |  | $ | 49,236 |
Accumulated Benefit Obligation |  | $ | 313,257 |  |  | $ | 274,414 |
|  | END OF FISCAL YEAR |
|  | 20 17 |  |  | 20 16 |
|  | (in thousands) |
UK Plan |  |  |  |  |  |  |  |
Projected Benefit Obligation |  | $ | 190,992 |  |  | $ | 171,172 |
Accumulated Benefit Obligation |  |  | 190,992 |  |  |  | 171,172 |
Plan Assets |  |  | 179,322 |  |  |  | 153,132 |
Dutch Plan |  |  |  |  |  |  |  |
Projected Benefit Obligation |  | $ | 129,554 |  |  | $ | 106,641 |
Accumulated Benefit Obligation |  |  | 122,265 |  |  |  | 103,242 |
Plan Assets |  |  | 127,844 |  |  |  | 105,233 |
|  | FISCAL YEAR |
|  | 2017 |  |  | 2016 |
|  | (in thousands) |
Change in benefit obligation |  |  |  |  |  |  |  |
Benefit obligation, beginning of year |  | $ | 29,700 |  |  | $ | 25,860 |
Service cost |  |  | 0 |  |  |  | 440 |
Interest cost |  |  | 1,256 |  |  |  | 1,269 |
Benefits paid |  |  | (1,943 | ) |  |  | (1,012 | )
Actuarial loss (gain) |  |  | 2,906 |  |  |  | 3,143 |
Benefit obligation, end of year |  | $ | 31,919 |  |  | $ | 29,700 |
|  | 20 17 |  |  | 20 16 |
|  | (in thousands) |
Current liabilities |  | $ | 2,030 |  |  | $ | 1,890 |
Non-current liabilities |  |  | 29,889 |  |  |  | 27,810 |
Total benefit obligation |  | $ | 31,919 |  |  | $ | 29,700 |
|  | 20 17 |  |  | 20 16 |
|  | (in thousands) |
Unrecognized actuarial loss |  |  | 8,582 |  |  | $ | 5,626 |
Schedule of Net Benefit Costs [Table Text Block] |
|  | FISCAL YEAR |
|  | 2017 |  |  | 2016 |  |  | 2015 |
|  | (in thousands) |
Components of net periodic benefit cost |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 1,628 |  |  | $ | 1,032 |  |  | $ | 1,061 |
Interest cost |  |  | 5,559 |  |  |  | 6,580 |  |  |  | 8,384 |
Expected return on plan assets |  |  | (6,496 | ) |  |  | (7,553 | ) |  |  | (8,764 | )
Amortization of prior service cost |  |  | (34 | ) |  |  | 33 |  |  |  | 33 |
Recognized net actuarial (gains)/losses |  |  | 1,287 |  |  |  | 1076 |  |  |  | 1,359 |
Net periodic benefit cost |  | $ | 1,944 |  |  | $ | 1,168 |  |  | $ | 2,073 |
Schedule of Assumptions Used [Table Text Block] |
|  | FISCAL YEAR |
|  | 201 7 |  |  | 201 6 |  |  | 201 5 |
Weighted average assumptions used to determine net periodic benefit cost |  |  |  |  |  |  |  |  |  |  |  |
Discount rate |  |  | 2.0 | % |  |  | 2.7 | % |  |  | 3.0 | %
Expected return on plan assets |  |  | 2.3 | % |  |  | 3.1 | % |  |  | 4.0 | %
Rate of compensation |  |  | 1.75 | % |  |  | 2.0 | % |  |  | 2.0 | %
Weighted average assumptions used to determine benefit obligations |  |  |  |  |  |  |  |  |  |  |  |
Discount rate |  |  | 2.2 | % |  |  | 2.3 | % |  |  | 3.4 | %
Rate of compensation |  |  | 1.75 | % |  |  | 2.0 | % |  |  | 2.0 | %
|  | 20 17 |  |  | 20 16 |  |  | 20 15 |
|  | (in thousands, except for assumptions) |
A ssumptions used to determine net periodic benefit cost |  |  |  |  |  |  |  |  |  |  |  |
Discount rate |  |  | 3.85 | % |  |  | 4.25 | % |  |  | 4.0 | %
Rate of compensation |  |  | - |  |  |  | 4.0 | % |  |  | 4.0 | %
Assumptions used to determine benefit obligations |  |  |  |  |  |  |  |  |  |  |  |
Discount rate |  |  | 3.5 | % |  |  | 3.85 | % |  |  | 4.25 | %
Rate of compensation |  |  | - |  |  |  | 4.0 | % |  |  | 4.0 | %
Components of net periodic benefit cost |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 0 |  |  | $ | 440 |  |  | $ | 594 |
Interest cost |  |  | 1,256 |  |  |  | 1,269 |  |  |  | 1,113 |
Amortization s |  |  | 364 |  |  |  | 811 |  |  |  | 522 |
Net periodic benefit cost |  | $ | 1,620 |  |  | $ | 2,520 |  |  | $ | 2,229 |
Schedule of Allocation of Plan Assets [Table Text Block] |
|  | FISCAL YEAR |
|  | 2018 |  |  | 2017 |  |  | 2016 |
|  | Target Allocation |  |  | Percentage of Plan Assets at Year End |
Asset Category: |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Securities |  | 15% | - | 20% |  |  |  | 16 | % |  |  | 15 | %
Debt and Debt Securities |  | 35% | - | 45% |  |  |  | 32 | % |  |  | 36 | %
Other |  | 40% | - | 50% |  |  |  | 52 | % |  |  | 49 | %
|  |  | 100% |  |  |  |  | 100 | % |  |  | 100 | %
|  | Pension Plan Assets by Category as of December 31, 2017 |
|  | Dutch Plan |  |  | UK Plan |  |  | Total |
|  |  |  |  |  | (in thousands) |  |  |  |  |
Level 1 |  | $ | 0 |  |  | $ | 87,521 |  |  | $ | 87,521 |
Level 2 |  |  | 0 |  |  |  | 68,668 |  |  |  | 68,668 |
Level 3 |  |  | 127,844 |  |  |  | 23,133 |  |  |  | 150,977 |
Total |  | $ | 127,844 |  |  | $ | 179,322 |  |  | $ | 307,166 |
|  | Pension Plan Assets by Category as of January 1, 2017 |
|  | Dutch Plan |  |  | UK Plan |  |  | Total |
|  |  |  |  |  | (in thousands) |  |  |  |  |
Level 1 |  | $ | 0 |  |  | $ | 80,048 |  |  | $ | 80,048 |
Level 2 |  |  | 0 |  |  |  | 50,364 |  |  |  | 50,364 |
Level 3 |  |  | 105,233 |  |  |  | 22,720 |  |  |  | 127,953 |
Total |  | $ | 105,233 |  |  | $ | 153,132 |  |  | $ | 258,365 |
|  | 2017 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |
|  |  |  |  |  | (in thousands) |  |  |  |  |
Asset Class |  |  |  |  |  |  |  |  |  |  |  |
Equity Securities |  | $ | 48,285 |  |  | $ | 0 |  |  | $ | 0 |
Debt and Debt Securities |  |  | 36,780 |  |  |  | 41,381 |  |  |  | 19,883 |
Other (including cash) |  |  | 2,456 |  |  |  | 27,287 |  |  |  | 131,094 |
|  | $ | 87,521 |  |  | $ | 68,668 |  |  | $ | 150,977 |
|  | 201 6 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |
|  |  |  |  |  | (in thousands) |  |  |  |  |
Asset Class |  |  |  |  |  |  |  |  |  |  |  |
Equity Securities |  | $ | 37,696 |  |  | $ | 0 |  |  | $ | 0 |
Debt and Debt Securities |  |  | 37,175 |  |  |  | 36,378 |  |  |  | 19,224 |
Other (including cash) |  |  | 5,177 |  |  |  | 13,986 |  |  |  | 108,729 |
|  | $ | 80,048 |  |  | $ | 50,364 |  |  | $ | 127,953 |
Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block] |
|  | 201 7 |
|  | (in thousands) |
Balance of level 3 assets, beginning of year |  | $ | 127,953 |
Interest cost |  |  | 2,633 |
Benefits paid |  |  | (3,728 | )
Assets transferred in to (out of) Level 3 |  |  | (2,089 | )
Actuarial gain (loss) |  |  | 8,753 |
Translation adjustment |  |  | 17,455 |
Ending Balance of level 3 assets |  | $ | 150,977 |
Schedule of Expected Benefit Payments [Table Text Block] |
FISCAL YEAR |  |  | EXPECTED PAYMENTS |
|  |  |  |  | (in thousands) |
201 8 |  |  |  |  | $ | 9,115 |
201 9 |  |  |  |  |  | 9,334 |
20 20 |  |  |  |  |  | 9,650 |
20 21 |  |  |  |  |  | 10,011 |
20 22 |  |  |  |  |  | 10,257 |
2023 | - | 2027 |  |  |  | 54,661 |
FISCAL YEAR |  |  | EXPECTED PAYMENTS |
|  |  |  |  | (in thousands) |
20 18 |  |  |  |  | $ | 2,030 |
20 19 |  |  |  |  |  | 2,030 |
20 20 |  |  |  |  |  | 2,030 |
20 21 |  |  |  |  |  | 2,030 |
202 2 |  |  |  |  |  | 2,030 |
2023 | - | 2027 |  |  |  | 9,990 |

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