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EMPLOYEE BENEFIT PLANS - Schedule of Pension Plan Assets Measured at Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
United States | Equity    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 13,162 $ 18,122
United States | Equity | NAV    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
United States | Equity | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 13,162 18,122
United States | Equity | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
United States | Equity | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
United States | Debt Securities and other    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 17,528 18,304
United States | Debt Securities and other | NAV    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
United States | Debt Securities and other | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 4,523 4,273
United States | Debt Securities and other | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 13,005 14,031
United States | Debt Securities and other | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
United States | Cash and cash equivalents    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 1,283 1,006
United States | Cash and cash equivalents | NAV    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
United States | Cash and cash equivalents | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 1,283 1,006
United States | Cash and cash equivalents | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
United States | Cash and cash equivalents | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Foreign Plan    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 271,472 319,033
Foreign Plan | NAV    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 3,710 4,586
Foreign Plan | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 57,363 64,555
Foreign Plan | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 200,475 236,769
Foreign Plan | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 9,924 13,123
Foreign Plan | Equity    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 95,058 138,874
Foreign Plan | Equity | NAV    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 3,710 4,586
Foreign Plan | Equity | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 34,848 38,647
Foreign Plan | Equity | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 56,500 95,641
Foreign Plan | Equity | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Foreign Plan | Debt Securities and other    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 125,587 111,204
Foreign Plan | Debt Securities and other | NAV    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Foreign Plan | Debt Securities and other | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Foreign Plan | Debt Securities and other | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 125,587 111,204
Foreign Plan | Debt Securities and other | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Foreign Plan | Cash and cash equivalents    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 3,547 2,507
Foreign Plan | Cash and cash equivalents | NAV    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Foreign Plan | Cash and cash equivalents | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 3,547 2,507
Foreign Plan | Cash and cash equivalents | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Foreign Plan | Cash and cash equivalents | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Foreign Plan | Insurance Contracts    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 15,307 29,016
Foreign Plan | Insurance Contracts | NAV    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Foreign Plan | Insurance Contracts | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Foreign Plan | Insurance Contracts | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 5,383 15,893
Foreign Plan | Insurance Contracts | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 9,924 $ 13,123