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EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Basic EPS Calculation
Net income available for common stock	$ 76,456	$ 64,743
Weighted Average Number of Shares Outstanding, Basic	52,576	52,519
Earnings Per Share, Basic	$ 1.45	$ 1.23
Diluted EPS Calculation
Net income available for common stock	$ 76,456	$ 64,743
Effect of dilutive securities on income	$ 0	$ 0
Effect of dilutive securities on shares	480	588
Weighted Average Number of Shares Outstanding, Diluted	53,056	53,107
Earnings Per Share, Diluted	$ 1.44	$ 1.22

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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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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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