SHAREHOLDERS' EQUITY (Details) - USD ($)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Equity [Abstract]
Common shares, authorized	65,000,000	65,000,000
Common shares, par value (in dollars per share)	$ 0.10	$ 0.1
Stock repurchased and retired during period, value	$ 31,400,000	$ 0	$ 3,800,000
Stock repurchased and retired during period, shares	749,614	0	144,600
Share-based Compensation
Increase in shareholders' equity as a result of stock options exercised	$ 0	$ 0	$ 0
Stock Options
Share-based Compensation
Shares retired that were received by employees as payment for the exercise price of their stock options and taxes owed upon exercise of their stock options and release of their restricted awards (in shares)	62,908	87,679	96,929
Stock Awards
Share-based Compensation
Shares forfeited during period	8,775	14,033	16,391

Face amount or stated value per share of common stock.

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

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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- Definition

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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For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

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Value of stock issued as a result of the exercise of stock options.

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Number of shares that have been repurchased and retired during the period.

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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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