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Postretirement Benefit Plans (Tables) | 9 Months Ended
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Sep. 30, 2017
Compensation And Retirement Disclosure [Abstract] |
Components of Net Periodic Benefit Cost | Components of Net Periodic Benefit Cost
|  | UNITED STATES |
(In thousands) |  | Three Months Ended September 30 |  |  | Nine Months Ended September 30 |
|  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Interest cost |  | $ | 1,665 |  |  | $ | 1,741 |  |  | $ | 4,988 |  |  | $ | 5,200 |
Expected return on plan assets |  |  | (2,323 | ) |  |  | (2,251 | ) |  |  | (6,966 | ) |  |  | (6,759 | )
Amortization of net actuarial loss |  |  | 738 |  |  |  | 776 |  |  |  | 2,314 |  |  |  | 2,540 |
Net periodic benefit cost |  | $ | 80 |  |  | $ | 266 |  |  | $ | 336 |  |  | $ | 981 |
|  | UNITED KINGDOM |
(In thousands) |  | Three Months Ended September 30 |  |  | Nine Months Ended September 30 |
|  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Interest cost |  | $ | 151 |  |  | $ | 177 |  |  | $ | 441 |  |  | $ | 564 |
Expected return on plan assets |  |  | (203 | ) |  |  | (218 | ) |  |  | (593 | ) |  |  | (694 | )
Amortization of net actuarial loss |  |  | 97 |  |  |  | 18 |  |  |  | 284 |  |  |  | 58 |
Net periodic benefit (income) cost |  | $ | 45 |  |  | $ | (23 | ) |  | $ | 132 |  |  | $ | (72 | )
Defined Contribution Plan Expenses for Company's Retirement Savings Plans and Profit Sharing Plan | Defined contribution plan expenses for the Company’s retirement savings and profit sharing plans were as follows:
(In thousands) |  | Three Months Ended September 30 |  |  | Nine Months Ended September 30 |
|  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Retirement savings plans |  | $ | 1,275 |  |  | $ | 1,304 |  |  | $ | 3,758 |  |  | $ | 3,849 |
Profit sharing plan |  |  | 1,308 |  |  |  | 1,595 |  |  |  | 5,259 |  |  |  | 5,098 |
Total defined contribution expense |  | $ | 2,583 |  |  | $ | 2,899 |  |  | $ | 9,017 |  |  | $ | 8,947 |

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- Definition Tabular disclosure of defined contribution pension plans or defined contribution other postretirement plans, separately for pension plans and other postretirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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