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Postretirement Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |
Obligations and Funded Status | Obligations and Funded Status at December 31
|  | United States |  |  | United Kingdom |
(In thousands) |  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Change in benefit obligation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Benefit obligation at beginning of year |  | $ | 162,727 |  |  | $ | 160,789 |  |  | $ | 22,034 |  |  | $ | 19,950 |
Interest cost |  |  | 6,651 |  |  |  | 6,934 |  |  |  | 592 |  |  |  | 733 |
Actuarial (gain) loss |  |  | 9,109 |  |  |  | 1,538 |  |  |  | (156 | ) |  |  | 5,614 |
Benefits paid |  |  | (7,129 | ) |  |  | (6,534 | ) |  |  | (516 | ) |  |  | (513 | )
Foreign exchange impact |  |  | — |  |  |  | — |  |  |  | 2,094 |  |  |  | (3,750 | )
Benefit obligation at end of year |  | $ | 171,358 |  |  | $ | 162,727 |  |  | $ | 24,048 |  |  | $ | 22,034 |
|  | United States |  |  | United Kingdom |
(In thousands) |  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Change in plan assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of plan assets at beginning of year |  | $ | 137,092 |  |  | $ | 121,835 |  |  | $ | 20,336 |  |  | $ | 21,425 |
Actual return on plan assets |  |  | 15,533 |  |  |  | 21,612 |  |  |  | 1,957 |  |  |  | 2,758 |
Employer contributions |  |  | 2,412 |  |  |  | 179 |  |  |  | 365 |  |  |  | 378 |
Benefits paid |  |  | (7,129 | ) |  |  | (6,534 | ) |  |  | (516 | ) |  |  | (513 | )
Foreign exchange impact |  |  | — |  |  |  | — |  |  |  | 2,026 |  |  |  | (3,712 | )
Fair value of plan assets at end of year |  | $ | 147,908 |  |  | $ | 137,092 |  |  | $ | 24,168 |  |  | $ | 20,336 |
Over (Under) funded status at end of year |  | $ | (23,450 | ) |  | $ | (25,635 | ) |  | $ | 120 |  |  | $ | (1,698 | )
Schedule of Amounts Recognized in Balance Sheets | The amounts recognized in the consolidated balance sheets at December 31 consisted of
|  | United States |  |  | United Kingdom |
(In thousands) |  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Non-current asset |  | $ | — |  |  | $ | — |  |  | $ | 120 |  |  |  | — |
Current liability |  |  | (302 | ) |  |  | (166 | ) |  |  | — |  |  |  | — |
Non-current liability |  |  | (23,148 | ) |  |  | (25,469 | ) |  |  | — |  |  |  | (1,698 | )
Net amount recognized |  | $ | (23,450 | ) |  | $ | (25,635 | ) |  | $ | 120 |  |  | $ | (1,698 | )
Amounts Recognized in Accumulated Other Comprehensive Income | The amounts recognized in accumulated other comprehensive income at December 31 consisted of
|  | United States |  |  | United Kingdom |
(In thousands) |  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Net actuarial loss |  | $ | 39,801 |  |  | $ | 40,022 |  |  | $ | 5,743 |  |  | $ | 7,443 |
Information for Pension Plans with Projected Benefit Obligations in Excess of Plan Assets | Below is information for pension plans with projected benefit obligations in excess of plan assets at December 31:
|  | United States |  |  | United Kingdom |
(In thousands) |  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Projected benefit obligation |  | $ | 171,358 |  |  | $ | 162,727 |  |  | $ | — |  |  | $ | 22,034 |
Accumulated benefit obligation |  |  | 171,358 |  |  |  | 162,727 |  |  |  | — |  |  |  | 22,034 |
Fair value of plan assets |  |  | 147,908 |  |  |  | 137,092 |  |  |  | — |  |  |  | 20,336 |
Components of Net Periodic Benefit Cost | Net periodic benefit costs for the years ended December 31, 2017, 2016 and 2015, were as follows:
|  | United States |  |  | United Kingdom |
(In thousands) |  | 2017 |  |  | 2016 |  |  | 2015 |  |  | 2017 |  |  | 2016 |  |  | 2015 |
Interest cost |  | $ | 6,651 |  |  | $ | 6,934 |  |  | $ | 6,815 |  |  | $ | 592 |  |  | $ | 733 |  |  | $ | 789 |
Expected return on plan assets |  |  | (9,288 | ) |  |  | (9,012 | ) |  |  | (9,579 | ) |  |  | (797 | ) |  |  | (900 | ) |  |  | (1,054 | )
Amortization of net actuarial loss |  |  | 3,085 |  |  |  | 3,386 |  |  |  | 4,534 |  |  |  | 382 |  |  |  | 77 |  |  |  | 179 |
Net periodic benefit cost |  | $ | 448 |  |  | $ | 1,308 |  |  | $ | 1,770 |  |  | $ | 177 |  |  | $ | (90 | ) |  | $ | (86 | )
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income | Other changes in plan assets and benefit obligations recognized in other comprehensive income for the years ended December 31, 2017, 2016 and 2015, were as follows:
|  | United States |  |  | United Kingdom |
(In thousands) |  | 2017 |  |  | 2016 |  |  | 2015 |  |  | 2017 |  |  | 2016 |  |  | 2015 |
Net actuarial (gain) loss |  | $ | 2,864 |  |  | $ | (11,062 | ) |  | $ | (1,110 | ) |  | $ | (1,318 | ) |  | $ | 3,756 |  |  | $ | (781 | )
Amortization of net actuarial loss |  |  | (3,085 | ) |  |  | (3,386 | ) |  |  | (4,534 | ) |  |  | (382 | ) |  |  | (77 | ) |  |  | (179 | )
Total recognized in other comprehensive income |  | $ | (221 | ) |  | $ | (14,448 | ) |  | $ | (5,644 | ) |  | $ | (1,700 | ) |  | $ | 3,679 |  |  | $ | (960 | )
Total recognized in net periodic benefit cost and other comprehensive income |  | $ | 227 |  |  | $ | (13,140 | ) |  | $ | (3,874 | ) |  | $ | (1,523 | ) |  | $ | 3,589 |  |  | $ | (1,046 | )
Estimated Amounts Reclassified from Accumulated Other Comprehensive Income into Net Periodic Benefit Cost | The estimated amounts that will be reclassified from accumulated other comprehensive income into net periodic benefit cost in 2018 are as follows:
(In thousands) |  | United States |  |  | United Kingdom |
Net actuarial loss |  | $ | 3,746 |  |  | $ | 222 |
Estimated Future Benefit Payments | Estimated Future Benefit Payments
(In thousands) |  | United States |  |  | United Kingdom |
2018 |  | $ | 7,560 |  |  | $ | 504 |
2019 |  |  | 7,956 |  |  |  | 511 |
2020 |  |  | 8,438 |  |  |  | 516 |
2021 |  |  | 8,973 |  |  |  | 539 |
2022 |  |  | 9,448 |  |  |  | 585 |
2023-2027 |  |  | 51,168 |  |  |  | 3,548 |
Defined Contribution Plan Expenses for Company's Retirement Savings Plans and Profit Sharing Plan | Defined contribution expenses for the Company’s qualified defined contribution plans were as follows:
(In thousands) |  | 2017 |  |  | 2016 |  |  | 2015 |
Retirement contributions |  | $ | 4,998 |  |  | $ | 4,902 |  |  | $ | 4,644 |
Profit sharing contributions |  |  | 7,002 |  |  |  | 6,230 |  |  |  | 4,972 |
Total |  | $ | 12,000 |  |  | $ | 11,132 |  |  | $ | 9,616 |
United States [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Company's Asset Allocations for its U.S. and U.K Pension Plans | The Company’s asset allocations for its U.S. pension plans at December 31, 2017 and 2016, by asset category, were as follows:
|  | December 31, 2017 |
(In thousands) |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Cash and Cash Equivalents |  | $ | 4,903 |  |  | $ | — |  |  | $ | — |  |  | $ | 4,903 |
Equity Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Equities |  |  | 37,753 |  |  |  | — |  |  |  | — |  |  |  | 37,753 |
Non-U.S. Equities |  |  | 31,581 |  |  |  | 47 |  |  |  | — |  |  |  | 31,628 |
Employer Securities |  |  | 30,197 |  |  |  | — |  |  |  | — |  |  |  | 30,197 |
Total Equities |  |  | 99,531 |  |  |  | 47 |  |  |  | — |  |  |  | 99,578 |
Fixed Income Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Corporate Bonds |  |  | — |  |  |  | 28,744 |  |  |  | — |  |  |  | 28,744 |
U.S. Government and Agency Bonds |  |  | 5,545 |  |  |  | 1,045 |  |  |  | — |  |  |  | 6,590 |
Other Bonds |  |  | — |  |  |  | 8,093 |  |  |  | — |  |  |  | 8,093 |
Total Fixed Income |  |  | 5,545 |  |  |  | 37,882 |  |  |  | — |  |  |  | 43,427 |
Total |  | $ | 109,979 |  |  | $ | 37,929 |  |  | $ | — |  |  | $ | 147,908 |
|  | December 31, 2016 |
(In thousands) |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Cash and Cash Equivalents |  | $ | 3,633 |  |  | $ | 275 |  |  | $ | — |  |  | $ | 3,908 |
Equity Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Equities |  |  | 29,390 |  |  |  | — |  |  |  | — |  |  |  | 29,390 |
Non-U.S. Equities |  |  | 14,637 |  |  |  | — |  |  |  | — |  |  |  | 14,637 |
Employer Securities |  |  | 36,018 |  |  |  | — |  |  |  | — |  |  |  | 36,018 |
Total Equities |  |  | 80,045 |  |  |  | — |  |  |  | — |  |  |  | 80,045 |
Fixed Income Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Corporate Bonds |  |  | — |  |  |  | 28,278 |  |  |  | — |  |  |  | 28,278 |
U.S. Government and Agency Bonds |  |  | 8,309 |  |  |  | 971 |  |  |  | — |  |  |  | 9,280 |
Other Bonds |  |  | — |  |  |  | 7,696 |  |  |  | — |  |  |  | 7,696 |
Total Fixed Income |  |  | 8,309 |  |  |  | 36,945 |  |  |  | — |  |  |  | 45,254 |
Mutual Funds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate |  |  | 5,362 |  |  |  | — |  |  |  | — |  |  |  | 5,362 |
Commodities |  |  | 2,523 |  |  |  | — |  |  |  | — |  |  |  | 2,523 |
Other |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Total Mutual Funds |  |  | 7,885 |  |  |  | — |  |  |  | — |  |  |  | 7,885 |
Total |  | $ | 99,872 |  |  | $ | 37,220 |  |  | $ | — |  |  | $ | 137,092 |
United Kingdom [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Company's Asset Allocations for its U.S. and U.K Pension Plans | The Company’s asset allocations for its U.K. pension plans at December 31, 2017 and 2016, by asset category, were as follows:
|  | December 31, 2017 |
(In thousands) |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Cash |  | $ | 745 |  |  | $ | — |  |  | $ | — |  |  | $ | 745 |
Equity Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pooled Pension Funds |  |  | — |  |  |  | 14,127 |  |  |  | — |  |  |  | 14,127 |
Fixed Income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pooled Pension Funds |  |  | — |  |  |  | 6,952 |  |  |  | — |  |  |  | 6,952 |
Real Estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pooled Pension Funds |  |  | — |  |  |  | 646 |  |  |  | — |  |  |  | 646 |
Insurance Contracts |  |  | — |  |  |  | — |  |  |  | 1,698 |  |  |  | 1,698 |
Total |  | $ | 745 |  |  | $ | 21,725 |  |  | $ | 1,698 |  |  | $ | 24,168 |
|  | December 31, 2016 |
(In thousands) |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Cash |  | $ | 243 |  |  | $ | — |  |  | $ | — |  |  | $ | 243 |
Equity Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pooled Pension Funds |  |  | — |  |  |  | 11,760 |  |  |  | — |  |  |  | 11,760 |
Fixed Income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pooled Pension Funds |  |  | — |  |  |  | 6,015 |  |  |  | — |  |  |  | 6,015 |
Real Estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pooled Pension Funds |  |  | — |  |  |  | 559 |  |  |  | — |  |  |  | 559 |
Insurance Contracts |  |  | — |  |  |  | — |  |  |  | 1,759 |  |  |  | 1,759 |
Total |  | $ | 243 |  |  | $ | 18,334 |  |  | $ | 1,759 |  |  | $ | 20,336 |
Fair Value Changes within Asset Categories for which Fair Value Measurements Use Significant Unobservable Inputs (Level 3) Defined Benefit United States Plans and United Kingdom Plans | Fair value changes within asset categories for which fair value measurements use significant unobservable inputs (Level 3) were as follows during 2016 and 2017:
(In thousands) |  | Insurance Contracts |
Fair value, December 31, 2015 |  | $ | 1,969 |
Sale proceeds (benefit payments) |  |  | (144 | )
Change in unrealized gain |  |  | 265 |
Foreign exchange impact |  |  | (331 | )
Fair value, December 31, 2016 |  | $ | 1,759 |
Sale proceeds (benefit payments) |  |  | (134 | )
Change in unrealized gain |  |  | (84 | )
Foreign exchange impact |  |  | 157 |
Fair value, December 31, 2017 |  | $ | 1,698 |
Defined Benefit Plan Periodic Costs [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Weighted-Average Assumptions Used to Determine Benefit Obligations/Net Periodic Benefit Costs | The weighted-average assumptions used to determine net periodic benefit costs for years ended December 31 were as follows:
|  | United States |  |  | United Kingdom |
|  | 2017 |  |  | 2016 |  |  | 2015 |  |  | 2017 |  |  | 2016 |  |  | 2015 |
Discount rate |  |  | 4.17 | % |  |  | 4.39 | % |  |  | 4.09 | % |  |  | 2.60 | % |  |  | 4.00 | % |  |  | 3.50 | %
Expected long-term return on plan assets |  |  | 7.00 | % |  |  | 7.00 | % |  |  | 7.50 | % |  |  | 3.77 | % |  |  | 4.59 | % |  |  | 4.66 | %
Benefit Obligation [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Weighted-Average Assumptions Used to Determine Benefit Obligations/Net Periodic Benefit Costs | The weighted-average assumptions used to determine benefit obligations at December 31 were as follows:
|  | United States |  |  | United Kingdom |
|  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Discount rate |  |  | 3.67 | % |  |  | 4.17 | % |  |  | 2.40 | % |  |  | 2.60 | %

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- Definition Tabular disclosure of the change in the benefit obligation, fair value of plan assets, and funded status of pension plans or other employee benefit plans. + 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 (a)(b)(c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the amounts that are recognized in the balance sheet (or statement of financial position) for pension plans and/or other employee benefit plans, showing separately the assets and current and noncurrent liabilities (if applicable) recognized. + 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 (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the benefit obligation and net benefit cost, including assumed discount rates, rate increase in compensation increase, and expected long-term rates of return on plan assets. + 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 (k) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + 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 (f) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + 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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