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Retirement Plans (Tables) | 9 Months Ended
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Sep. 30, 2016
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract] |
Schedule of Defined Benefit Plans Disclosures [Table Text Block] | The following tables provide the components of net periodic benefit costs for the three- and nine-month periods ended 9/30/2016 and 2015.
|  |  |  | Select |  |
|  | Employees' |  | Executive |  | Postretirement
|  | Pension |  | Retirement |  | Benefit
|  | Plan |  | Plan |  | Plans
Net Periodic Benefit Cost |  |  |  |  |  |
For the Three Months Ended September 30, 2016: |  |  |  |  |  |
Service Cost |  | $ | 376 |  |  | $ | 8 |  |  | $ | 63 |
Interest Cost |  | 420 |  |  | 56 |  |  | 83 |
Expected Return on Plan Assets |  | (828 | ) |  | — |  |  | — |
Amortization of Prior Service (Credit) Cost |  | (14 | ) |  | 14 |  |  | (3 | )
Amortization of Net Loss |  | 140 |  |  | 28 |  |  | — |
Net Periodic Benefit Cost |  | $ | 94 |  |  | $ | 106 |  |  | $ | 143 |
Plan Contributions During the Period |  | $ | — |  |  | $ | 131 |  |  | $ | 47 |
For the Three Months Ended September 30, 2015: |  |  |  |  |  |
Service Cost |  | $ | 353 |  |  | $ | 3 |  |  | $ | 43 |
Interest Cost |  | 402 |  |  | 61 |  |  | 144 |
Expected Return on Plan Assets |  | (808 | ) |  | — |  |  | — |
Amortization of Prior Service (Credit) Cost |  | (21 | ) |  | 15 |  |  | (8 | )
Amortization of Net Loss |  | 139 |  |  | 30 |  |  | 24 |
Net Periodic Benefit Cost |  | $ | 65 |  |  | $ | 109 |  |  | $ | 203 |
Plan Contributions During the Period |  | $ | 3,000 |  |  | $ | 70 |  |  | $ | 106 |
Net Periodic Benefit Cost |  |  |  |  |  |
For the Nine Months Ended September 30, 2016: |  |  |  |  |  |
Service Cost |  | $ | 1,127 |  |  | $ | 24 |  |  | $ | 188 |
Interest Cost |  | 1,262 |  |  | 163 |  |  | 178 |
Expected Return on Plan Assets |  | (2,483 | ) |  | — |  |  | — |
Amortization of Prior Service Cost (Credit) |  | (42 | ) |  | 43 |  |  | (8 | )
Amortization of Net Loss |  | 419 |  |  | 84 |  |  | — |
Net Periodic Benefit Cost |  | $ | 283 |  |  | $ | 314 |  |  | $ | 358 |
Plan Contributions During the Period |  | $ | — |  |  | $ | 350 |  |  | $ | 197 |
Estimated Future Contributions in the Current Fiscal Year |  | $ | — |  |  | $ | 117 |  |  | $ | 66 |
For the Nine Months Ended September 30, 2015: |  |  |  |  |  |
Service Cost |  | $ | 1,058 |  |  | $ | 8 |  |  | $ | 130 |
Interest Cost |  | 1,203 |  |  | 182 |  |  | 361 |
Expected Return on Plan Assets |  | (2,423 | ) |  | — |  |  | — |
Amortization of Prior Service (Credit) Cost |  | (62 | ) |  | 44 |  |  | (23 | )
Amortization of Net Loss |  | 417 |  |  | 91 |  |  | 71 |
Net Periodic Benefit Cost |  | $ | 193 |  |  | $ | 325 |  |  | $ | 539 |
Plan Contributions During the Period |  | $ | 3,000 |  |  | $ | 344 |  |  | $ | 231 |
We were not required to make a contribution to our qualified pension plan in 2016, and currently, we do not expect to make additional contributions in 2016. Arrow makes contributions to its other post-retirement benefit plans in an amount equal to benefit payments for the year.

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2439-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2417-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2410-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=73719040&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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