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Benefit Plans Benefit Plans (Detail 10) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Actual return on plan assets: |  |  |
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss) | $ (11,532) | $ 36,883 |
Defined Benefit Plan, Plan Assets, Amount | 862,951 | 919,782 | $ 820,272
Fair Value, Inputs, Level 3 [Member] |  |  |
Actual return on plan assets: |  |  |
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Actual Return (Loss) on Plan Assets Still Held | 14 | 21 |
Defined Benefit Plan Sales, Total | (85) | (5,809) |
Defined Benefit Plan, Purchases, Total | 82 | 108 |
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss) | (64) | 300 |
Defined Benefit Plan, Plan Assets, Amount | 1,461 | 1,514 | 6,894
Real Asset Mutual Funds, Commodities |  |  |
Actual return on plan assets: |  |  |
Defined Benefit Plan, Plan Assets, Amount | 40,267 | 37,302 |
Real Asset Mutual Funds, Commodities | Fair Value, Inputs, Level 3 [Member] |  |  |
Actual return on plan assets: |  |  |
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Actual Return (Loss) on Plan Assets Still Held | 0 | 0 |
Defined Benefit Plan Sales, Total | 0 | (5,711) |
Defined Benefit Plan, Purchases, Total | 0 | 0 |
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss) | 0 | 117 |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 | 5,594
Fixed Income Mutual Funds, Insurance Contracts |  |  |
Actual return on plan assets: |  |  |
Defined Benefit Plan, Plan Assets, Amount | 24,313 | 24,935 |
Fixed Income Mutual Funds, Insurance Contracts | Fair Value, Inputs, Level 3 [Member] |  |  |
Actual return on plan assets: |  |  |
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Actual Return (Loss) on Plan Assets Still Held | 14 | 21 |
Defined Benefit Plan Sales, Total | (85) | (98) |
Defined Benefit Plan, Purchases, Total | 82 | 108 |
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss) | (64) | 183 |
Defined Benefit Plan, Plan Assets, Amount | $ 1,461 | $ 1,514 | $ 1,300

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- Definition Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 + Details
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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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