Employee Benefit Plans - Actual Fair Values of Pension Plans (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Non-US
Defined Benefit Plan Disclosure [Line Items]
Carrying Amount	$ 76,429	$ 68,597
Estimated Fair Value Measurements	76,429	68,597	$ 77,141
Non-US | Quoted Prices in Active Markets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	76,429	68,597
Non-US | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	0	0
Non-US | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	0	0
Non-US | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Carrying Amount	903	151
Non-US | Cash and cash equivalents | Quoted Prices in Active Markets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	903	151
Non-US | Cash and cash equivalents | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	0	0
Non-US | Cash and cash equivalents | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	0	0
Non-US | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Carrying Amount	26,131	25,585
Non-US | Equity securities | Quoted Prices in Active Markets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	26,131	25,585
Non-US | Equity securities | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	0	0
Non-US | Equity securities | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	0	0
Non-US | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Carrying Amount	49,395	42,861
Non-US | Corporate bonds | Quoted Prices in Active Markets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	49,395	42,861
Non-US | Corporate bonds | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	0	0
Non-US | Corporate bonds | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	0	0
Non-US | Other
Defined Benefit Plan Disclosure [Line Items]
Carrying Amount		0
Non-US | Other | Quoted Prices in Active Markets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements		0
Non-US | Other | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements		0
Non-US | Other | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements		0
US plans
Defined Benefit Plan Disclosure [Line Items]
Carrying Amount	194,160	165,730
Estimated Fair Value Measurements	194,160	165,730	$ 189,240
US plans | Quoted Prices in Active Markets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	153,298	129,401
US plans | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	40,862	36,329
US plans | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	0	0
US plans | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Carrying Amount	2,254	4,801
US plans | Cash and cash equivalents | Quoted Prices in Active Markets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	2,254	4,801
US plans | Cash and cash equivalents | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	0	0
US plans | Cash and cash equivalents | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	0	0
US plans | United States, equity securities
Defined Benefit Plan Disclosure [Line Items]
Carrying Amount	60,422	47,950
US plans | United States, equity securities | Quoted Prices in Active Markets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	21,502	16,775
US plans | United States, equity securities | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	38,920	31,175
US plans | United States, equity securities | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	0	0
US plans | International, equity securities
Defined Benefit Plan Disclosure [Line Items]
Carrying Amount	23,470	17,838
US plans | International, equity securities | Quoted Prices in Active Markets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	23,470	17,838
US plans | International, equity securities | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	0	0
US plans | International, equity securities | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	0	0
US plans | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Carrying Amount	75,131	64,802
US plans | Corporate bonds | Quoted Prices in Active Markets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	74,253	59,648
US plans | Corporate bonds | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	878	5,154
US plans | Corporate bonds | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	0	0
US plans | Municipal bonds
Defined Benefit Plan Disclosure [Line Items]
Carrying Amount	1,064
US plans | Municipal bonds | Quoted Prices in Active Markets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	0
US plans | Municipal bonds | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	1,064
US plans | Treasury bonds
Defined Benefit Plan Disclosure [Line Items]
Carrying Amount	31,819	30,339
US plans | Treasury bonds | Quoted Prices in Active Markets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	31,819	30,339
US plans | Treasury bonds | Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	0	0
US plans | Treasury bonds | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Estimated Fair Value Measurements	$ 0	$ 0