Fair market value of shares issued per director per year

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Number of common stock shares.

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The percentage of the Performance Unit Award earned at a certain point in time.

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Percentage of award distributed

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The period over which company performance metrics are earned for determination of performance-based award payouts.

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Share Based Compensation Arrangement By Share Based Payment Award Shares Available For Issuance Under Current Plan

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Share Based Compensation [Line Items]

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Grant Date Fair Value

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- Definition

The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Amount of deferred tax expense from write-off of the deferred tax asset related to deductible stock options at exercise.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Gross number of share options (or share units) granted during the period.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Stock-based Compensation Expense - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share Based Compensation [Line Items]
Stock options granted during the period (in shares)	63,259	82,204	141,661
Common stock authorized for non-employee directors (in shares)	150,000,000	150,000,000
Stock-based compensation	$ 15,228,000	$ 19,404,000	$ 17,031,000
Tax benefits recognized related to stock based compensation	2,600,000	7,000,000	6,200,000
Proceeds from stock option exercised	$ 3,633,000	8,238,000	9,401,000
Minimum
Share Based Compensation [Line Items]
Share-based awards vesting period	1 year
Maximum
Share Based Compensation [Line Items]
Share-based awards vesting period	5 years
Stock Incentive Plan Twenty Seventeen
Share Based Compensation [Line Items]
Shares available for grant (in shares)	4,280,607
Stock Incentive Plan Twenty Seventeen \| Maximum
Share Based Compensation [Line Items]
Number of shares available for issuance under incentive plan (in shares)	4,500,000
Non Employee Directors, Plan
Share Based Compensation [Line Items]
Common stock authorized for non-employee directors (in shares)	500,000
Shares available for grant (in shares)	388,179
Non Employee Directors, Plan \| Maximum
Share Based Compensation [Line Items]
Fair market value of shares issued per director per year	$ 150,000
Stock Options
Share Based Compensation [Line Items]
Share-based awards vesting period	3 years
Stock options, term	10 years
Intrinsic value of stock options exercised	$ 6,200,000	15,600,000	7,900,000
Compensation cost not yet recognized for nonvested share	$ 3,000,000
Remaining weighted average period for recognition of compensation cost years	1 year 6 months 14 days
Proceeds from stock option exercised	$ 3,600,000
Tax benefit from stock option exercised	1,500,000
Restricted Stock And Restricted Stock Units
Share Based Compensation [Line Items]
Compensation cost not yet recognized for nonvested share	$ 12,600,000
Remaining weighted average period for recognition of compensation cost years	1 year 362 days
Weighted average grant date fair value	$ 10,900,000	8,200,000	8,800,000
Weighted average fair value of awards vested in period	$ 4,900,000	3,100,000	3,200,000
Restricted Stock And Restricted Stock Units \| Minimum
Share Based Compensation [Line Items]
Share-based awards vesting period	1 year
Restricted Stock And Restricted Stock Units \| Maximum
Share Based Compensation [Line Items]
Share-based awards vesting period	5 years
Performance Unit Awards
Share Based Compensation [Line Items]
Compensation cost not yet recognized for nonvested share	$ 11,600,000
Remaining weighted average period for recognition of compensation cost years	1 year
Weighted average grant date fair value	$ 10,900,000	9,600,000	10,900,000
Weighted average fair value of awards vested in period	$ 20,000,000	$ 11,900,000	4,600,000
Number of common stock share for each performance unit (in shares)	1
Performance Unit Awards \| Minimum
Share Based Compensation [Line Items]
Performance unit award payout percentage	0.00%
Specific performance criteria period	1 year
Performance Unit Awards \| Maximum
Share Based Compensation [Line Items]
Performance unit award payout percentage	200.00%
Specific performance criteria period	3 years
Two Year Measurement Period
Share Based Compensation [Line Items]
Percentage of award distributed	50.00%
One Year Vesting Period Thereafter
Share Based Compensation [Line Items]
Percentage of award distributed	50.00%
Chemetall Surface Treatment
Share Based Compensation [Line Items]
Stock-based compensation			$ 5,800,000
Accrued Liabilities \| Chemetall Surface Treatment
Share Based Compensation [Line Items]
Stock-based compensation	$ 2,200,000
Other Noncurrent Liabilities \| Chemetall Surface Treatment
Share Based Compensation [Line Items]
Stock-based compensation	$ 1,200,000