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Note 7 - Employee Benefit Plans | 9 Months Ended
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Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract] |
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, 2015 and 2014 (in thousands):
|  | Three Months Ended September 30, |
|  | 2015 |  |  | 2014 |
Service cost |  | $ | 1,054 |  |  | $ | 1,020 |
Interest cost |  |  | 1,206 |  |  |  | 1,186 |
Expected return on plan assets |  |  | (1,345 | ) |  |  | (1,249 | )
Amortization of prior service cost |  |  | (84 | ) |  |  | (84 | )
Amortization of net loss |  |  | 1,065 |  |  |  | 756 |
Net periodic pension cost |  | $ | 1,896 |  |  | $ | 1,629 |
|  | Nine Months Ended September 30, |
|  | 2015 |  |  | 2014 |
Service cost |  | $ | 3,162 |  |  | $ | 3,060 |
Interest cost |  |  | 3,618 |  |  |  | 3,558 |
Expected return on plan assets |  |  | (4,036 | ) |  |  | (3,747 | )
Amortization of prior service cost |  |  | (253 | ) |  |  | (252 | )
Amortization of net loss |  |  | 3,195 |  |  |  | 2,268 |
Net periodic pension cost |  | $ | 5,686 |  |  | $ | 4,887 |
In January 2015, we contributed approximately $5.0 million in shares of our common stock to our defined benefit plans, with no additional contributions required during the rest of 2015. We expect to contribute approximately $0.4 million to our unfunded supplemental executive retirement plan during 2015.

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