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EARNINGS PER SHARE - EARNINGS PER SHARE (Details) - USD ($)	12 Months Ended			36 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Payments for Repurchase of Common Stock	$ 127,169,000	$ 106,792,000	$ 4,818,000
Treasury Stock, Shares, Acquired	2,003,446	1,778,537
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities	0	0	3,674,000
Stock Appreciation Rights (SARs)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share	1,600,000	1,300,000	1,200,000
Convertible Debt Securities [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Debt Instrument, Convertible, Conversion Price	$ 28.87
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities	11,951,932
Dilutive Securities, Effect on Basic Earnings Per Share			$ 0.17
Treasury Stock, Common [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Treasury Stock, Common, Shares		4,247,113		4,247,113
Payments for Repurchase of Common Stock	$ 125,000,000	$ 100,000,000		$ 250,000,000
Treasury Stock, Shares, Acquired	2,003,446	1,778,537

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Amount of increase (decrease) to net income used for calculating diluted earnings per share (EPS), resulting from the assumed exercise stock options, restrictive stock units (RSUs), convertible preferred stock of an employee stock ownership plan (ESOP), and other dilutive convertible securities.

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