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Note 7 - Employee Benefit Plans | 3 Months Ended
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Mar. 31, 2017
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 months ended March 31, 2017 and 2016 (in thousands):
|  | Three Months Ended March 31, |
|  | 2017 |  |  | 2016 |
Service cost |  | $ | 1,196 |  |  | $ | 1,077 |
Interest cost |  |  | 1,339 |  |  |  | 1,307 |
Expected return on plan assets |  |  | (1,462 | ) |  |  | (1,325 | )
Amortization of prior service benefit |  |  | (84 | ) |  |  | (84 | )
Amortization of net loss |  |  | 1,033 |  |  |  | 1,093 |
Net periodic benefit cost |  | $ | 2,022 |  |  | $ | 2,068 |
In April 2017, we contributed $1.2 million in cash to our defined benefit plans, and expect to contribute an additional $2.8 million in cash or shares of our common stock to our defined benefit plans in 2017. We expect to contribute approximately $0.4 million to our unfunded supplemental executive retirement plan during 2017.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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