CAPITAL STOCK (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
CAPITAL STOCK
Authorized common stock (in shares)	199,000,000us-gaap_CommonStockSharesAuthorized	199,000,000us-gaap_CommonStockSharesAuthorized
Common stock and treasury stock and the share activity
Balance at the beginning of the year (in shares)	85,400,000us-gaap_CommonStockSharesIssued
Common stock repurchases (in shares)	4,500,000us-gaap_TreasuryStockSharesAcquired	2,000,000us-gaap_TreasuryStockSharesAcquired
Balance at the end of the year (in shares)	86,300,000us-gaap_CommonStockSharesIssued	85,400,000us-gaap_CommonStockSharesIssued
Cash dividends paid on the common stock (in shares)	$ 71,072us-gaap_PaymentsOfDividendsCommonStock	$ 66,133us-gaap_PaymentsOfDividendsCommonStock	$ 58,442us-gaap_PaymentsOfDividendsCommonStock
Common Stock Par Value
Common stock and treasury stock and the share activity
Balance at the beginning of the year (in shares)	85,364,303	84,086,341
Restricted stock vestings (in shares)	9,924	12,046
Balance at the end of the year (in shares)	86,267,467	85,364,303
Common Stock Par Value \| Stock Awards Plans
Common stock and treasury stock and the share activity
Stock option exercises (in shares)	851,396	1,217,583
Common Stock Par Value \| Director Stock Option Plans
Common stock and treasury stock and the share activity
Stock option exercises (in shares)	41,844	48,333
Treasury Stock
Common stock and treasury stock and the share activity
Balance at the beginning of the year (in shares)	19,979,833	18,158,002
Common stock repurchases (in shares)	4,533,814	2,001,000
Balance at the end of the year (in shares)	24,336,367	19,979,833
Treasury Stock \| Stock Awards Plans
Common stock and treasury stock and the share activity
Stock option exercises (in shares)	(177,280)	(179,169)

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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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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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

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

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Number of shares that have been repurchased during the period and are being held in treasury.

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