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Defined Benefit Plans Plan Asset Allocation, Fair Value Hierarchy (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | ---
Defined Benefit Plan, Fair Value of Plan Assets |  | $ 1,337,405 |  | $ 1,469,103 |  |
Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | 457,361 |  | 523,253 |  |
Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | 403,495 |  | 469,004 |  |
Measured at Net Asset Value [Member] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | [1] | 476,549 |  | 476,846 |  |
U.S. Plans [Member] | U.S. Large Cap [Member] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | 100,226 |  | 104,164 |  |
U.S. Plans [Member] | U.S. Small Mid Cap [Member] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | 48,773 |  | 63,210 |  |
U.S. Plans [Member] | International Securities [Member] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | 58,642 |  | 58,713 |  |
U.S. Plans [Member] | U.S. Government and Corporate [Member] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | 143,787 |  | 157,872 |  |
U.S. Plans [Member] | Structured Loan Fund [Member] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  |  |  | 1,226 |  |
U.S. Plans [Member] | Other Securities [Member] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | 4,728 | [2] | 4,421 | [3] |
U.S. Plans [Member] | Fair Value, Inputs, Level 1 [Member] | U.S. Large Cap [Member] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  |  |  | 3,901 |  |
U.S. Plans [Member] | Fair Value, Inputs, Level 1 [Member] | U.S. Small Mid Cap [Member] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | 7,874 |  | 19,540 |  |
U.S. Plans [Member] | Fair Value, Inputs, Level 1 [Member] | International Securities [Member] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  |  |  | 2,461 |  |
U.S. Plans [Member] | Fair Value, Inputs, Level 1 [Member] | U.S. Government and Corporate [Member] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  |  |  | 10,508 |  |
U.S. Plans [Member] | Fair Value, Inputs, Level 1 [Member] | Other Securities [Member] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | 1,811 | [2] | $ 1,623 | [3] |
U.S. Plans [Member] | Fair Value, Inputs, Level 3 [Member] | Structured Loan Fund [Member] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  |  |  |  |  |
U.S. Plans [Member] | Measured at Net Asset Value [Member] | U.S. Large Cap [Member] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | [1] | 100,226 |  | $ 100,263 |  |
U.S. Plans [Member] | Measured at Net Asset Value [Member] | U.S. Small Mid Cap [Member] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | [1] | 40,899 |  | 43,670 |  |
U.S. Plans [Member] | Measured at Net Asset Value [Member] | International Securities [Member] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | [1] | 58,642 |  | 56,252 |  |
U.S. Plans [Member] | Measured at Net Asset Value [Member] | U.S. Government and Corporate [Member] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | [1] | 143,787 |  | 147,364 |  |
U.S. Plans [Member] | Measured at Net Asset Value [Member] | Structured Loan Fund [Member] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  |  |  | 1,226 |  |
U.S. Plans [Member] | Measured at Net Asset Value [Member] | Other Securities [Member] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | 2,917 | [1],[2] | 2,798 | [3],[4] |
Foreign Pension Plans [Member] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | 981,249 |  | 1,079,497 |  | $ 999,197
Foreign Pension Plans [Member] | Cash and Cash Equivalents [Member] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | 12,832 |  | 12,951 |  |
Foreign Pension Plans [Member] | Equity Securities [Member] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | 312,852 |  | 326,107 |  |
Foreign Pension Plans [Member] | Non-U.S. Government and Corporate Bonds [Member] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | 626,374 |  | 707,990 |  |
Foreign Pension Plans [Member] | Other Securities [Member] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | 29,191 | [2] | 32,449 | [3] |
Foreign Pension Plans [Member] | Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | 12,832 |  | 12,951 |  |
Foreign Pension Plans [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | 150,376 |  | 161,524 |  |
Foreign Pension Plans [Member] | Fair Value, Inputs, Level 1 [Member] | Non-U.S. Government and Corporate Bonds [Member] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | 282,504 |  | 308,705 |  |
Foreign Pension Plans [Member] | Fair Value, Inputs, Level 1 [Member] | Other Securities [Member] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | 1,964 | [2] | 2,040 | [3] |
Foreign Pension Plans [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | 32,398 |  | 39,310 |  |
Foreign Pension Plans [Member] | Fair Value, Inputs, Level 2 [Member] | Non-U.S. Government and Corporate Bonds [Member] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | 343,870 |  | 399,285 |  |
Foreign Pension Plans [Member] | Fair Value, Inputs, Level 2 [Member] | Other Securities [Member] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | 27,227 | [2] | 30,409 | [3] |
Foreign Pension Plans [Member] | Measured at Net Asset Value [Member] | Equity Securities [Member] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | [1] | $ 130,078 |  | $ 125,273 |  |
[1] | In accordance with ASU No. 2015-07, certain investments that are measured at fair value using the net asset value per share (or its equivalent)practical expedient (the “NAV”) have not been classified in the fair value hierarchy. These investments, consisting of common/collective trusts, are valued using the NAV provided by the Trustee. The NAV is based on the underlying investments held by the fund, that are traded in an active market, less its liabilities. These investments are able to be redeemed in the near-term. See further discussion in Note 3, “Recently Issued Accounting Pronouncements”.
[2] | Represents diversified portfolio funds, real estate and reinsurance contracts and money market funds.
[3] | Represents diversified portfolio funds and reinsurance contracts maintained for certain plans.
[4] | In accordance with ASU No. 2015-07, certain investments that are measured at fair value using the net asset value per share (or its equivalent)practical expedient (the “NAV”) have not been classified in the fair value hierarchy. These investments, consisting primarily of common/collective trusts, are valued using the NAV provided by the Trustee. The NAV is based on the underlying investments held by the fund, that are traded in an active market, less its liabilities. These investments are able to be redeemed in the near-term. See further discussion in Note 3, “Recently Issued Accounting Pronouncements”.

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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