Stock-Based Compensation Stock Options (Details) - Equity Option [Member] $ / shares in Units, shares in Thousands, $ in Thousands	4 Months Ended	9 Months Ended
Sep. 30, 2019 USD ($) $ / shares shares	Sep. 30, 2019 USD ($) $ / shares shares	Sep. 30, 2019 USD ($) $ / shares shares
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Vesting period			3 years
Stock options outstanding at beginning of period \| shares	10,468
Stock options exercised during the period \| shares	(178)
Stock options forfeited / expired \| shares	(36)
Stock options outstanding at end of period \| shares	10,254	10,254	10,254
Stock options exercisable at end of period \| shares	8,215	8,215	8,215
Stock options outstanding, weighted average exercise price, beginning of period \| $ / shares	$ 32.11
Stock options exercised during the period, weighted average exercise price \| $ / shares	21.23
Stock options forfeited / expired, weighted average exercise price \| $ / shares	38.26
Stock options outstanding, weighted average exercise price, end of period \| $ / shares	32.28	$ 32.28	$ 32.28
Stock options exercisable, Weighted Average Exercise Price \| $ / shares	$ 30.32	$ 30.32	$ 30.32
Stock options outstanding, weighted average remaining contractual term		4 years 10 months 24 days
Stock options exercisable, Weighted Average Remaining Contractual Term		4 years 1 month 13 days
Stock options outstanding, intrinsic value \| $	$ 15,855	$ 15,855	$ 15,855
Stock options exercisable, Intrinsic Value \| $	14,868	14,868	14,868
Unrecognized pre-tax compensation expense \| $	$ 5,000	$ 5,000	$ 5,000
Unrecognized pre-tax compensation expense, period for recognition		1 year
EIP [Member] \| Grants between 2013 and 2015 [Member]
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Expiration period			7 years
EIP [Member] \| Grants between 2016 and 2018 [Member]
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Expiration period			10 years
Dow [Member]
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Expiration period			10 years

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cost to be recognized for option under share-based payment arrangement.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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