Income Taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Deferred Tax Assets, Net	$ 86,885	$ 102,002
Defered Tax Liabilties, Net	263,082	298,351
Operating Loss Carryforwards, Valuation Allowance	10,200	8,200
Tax Cuts and Jobs Act, Transition Tax for Accumulated Foreign Earnings, Liability	15,500
Tax Cuts And Jobs Act Of 2017 Transition Tax For Accumulated Foreign Earnings Liability Installments Paid	7,000
Tax Cuts And Jobs Act Of 2017 Transition Tax For Accumulated Foreign Earnings Liability Remaining Installments	8,500
Tax Cuts And Jobs Act Of 2017 Accounting Earnings Of Foreign Subsidiary	322,600
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	11,300
Deferred Tax Assets, Partial Valuation Allowance, Net Expected Future Benefit	3,300
Operating Loss Carryforwards, State, Partial Valuation Allowance	8,000
Operating Loss Carryforwards, Foreign, Partial Valuation Allowance	1,700
Deferred Tax Assets Operating Loss Carryforwards State And Local Based On Reversal Of Deferred Tax Liabilities	$ 3,300
Deferred Tax Assets Operating Loss Carryforwards Foreign Expiration Period	10 years
Deferred Tax Assets, Operating Loss Carryforwards, Foreign	$ 5,400
Deferred Tax Assets, Tax Credit Carryforwards, Foreign	24,873	34,384
Deferred Tax Assets Tax Credit Carryforwards Foreign Expected To Expire	24,900	33,700
Deferred Tax Assets, Acquired Disallowed Interest	15,700
Unrecognized Tax Benefits	22,152	19,097	$ 7,050	$ 6,761
Unrecognized Tax Benefits, Income Tax Penalties Accrued	3,900	3,100
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	3,000	2,300
Unrecognized Tax Benefits, Interest on Income Taxes Expense	600	200	100
Unrecognized Tax Benefits, Reductions Resulting from Lapse of Applicable Statute of Limitations	3,659	1,029	1,292
Unrecognized Tax Benefits If Recognized	14,700	13,300	2,200
Indemnification assets	7,615	4,006
Valuation Allowance Amount State Deferred tax asset	1,000
Valuation allowance amount Other Foreign Deferred Tax Asset	600
Income Tax Reconciliation Change In Enacted Tax Rate	(1,059)	$ (416)	$ (3,118)
Combination And Norman Hay [Member]
Deferred Tax Assets, Tax Credit Carryforwards, Foreign	41,800
Deferred Tax Assets, Acquired Disallowed Interest	14,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities	222,800
Korea Houghton Coporation [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities	$ 7,900
Business Acquisition, Percentage of Voting Interests Acquired		50.00%
Expiration In Year Five [Member]
Deferred Tax Assets Operating Loss Carryforwards State And Local Expiration Period	5 years
Expiration In Twenty Years [Member]
Deferred Tax Assets Operating Loss Carryforwards State And Local Expiration Period	20 years
Foreign Tax Authority [Member]
Defered Tax Liabilties, Net	$ 5,900