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Note 7 - Employee Benefit Plans | 9 Months Ended
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Sep. 30, 2016
Notes to Financial Statements |
Pension and Other Postretirement Benefits Disclosure [Text Block] | Note 7. Employee Benefit Plans We sponsor defined benefit pension plans covering substantially all U.S. employees. Net periodic pension cost for the plans consisted of the following for the three and nine months ended September 30, 2016 and 2015 (in thousands):
|  | Three Months Ended September 30, |
|  | 2016 |  |  | 2015 |
Service cost |  | $ | 1,077 |  |  | $ | 1,054 |
Interest cost |  |  | 1,307 |  |  |  | 1,206 |
Expected return on plan assets |  |  | (1,325 | ) |  |  | (1,345 | )
Amortization of prior service cost |  |  | (84 | ) |  |  | (84 | )
Amortization of net loss |  |  | 1,093 |  |  |  | 1,065 |
Net periodic pension cost |  | $ | 2,068 |  |  | $ | 1,896 |
|  | Nine Months Ended September 30, |
|  | 2016 |  |  | 2015 |
Service cost |  | $ | 3,231 |  |  | $ | 3,162 |
Interest cost |  |  | 3,921 |  |  |  | 3,618 |
Expected return on plan assets |  |  | (3,975 | ) |  |  | (4,036 | )
Amortization of prior service cost |  |  | (252 | ) |  |  | (253 | )
Amortization of net loss |  |  | 3,279 |  |  |  | 3,195 |
Net periodic pension cost |  | $ | 6,204 |  |  | $ | 5,686 |
We contributed approximately $2.6 million in shares of our common stock and cash to our defined benefit plans in February 2016, and $6.1 million in shares of our common stock in July 2016, with no additional contributions anticipated in 2016. We expect to contribute approximately $0.4 million to our unfunded supplemental executive retirement plan during 2016.

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