EARNINGS PER SHARE (Tables)

6 Months Ended

Jun. 30, 2019

EARNINGS PER SHARE [Line Items]

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	Three Months Ended June 30, 2019
	Income		Shares	Per Share Amount
	(Thousands, except per share amounts)
Basic EPS Calculation
Net income available for common stock	$	24,470	52,890	$	0.46
Diluted EPS Calculation
Effect of dilutive securities	—		325
Net income available for common stock and common stock equivalents	$	24,470	53,215	$	0.46

	Three Months Ended June 30, 2018
	Income		Shares	Per Share Amount
	(Thousands, except per share amounts)
Basic EPS Calculation
Net income available for common stock	$	20,419	52,692	$	0.39
Diluted EPS Calculation
Effect of dilutive securities	—		207
Net income available for common stock and common stock equivalents	$	20,419	52,899	$	0.39

	Six Months Ended June 30, 2019
	Income		Shares	Per Share Amount
	(Thousands, except per share amounts)
Basic EPS Calculation
Net income available for common stock	$	118,130	52,858	$	2.23
Diluted EPS Calculation				—
Effect of dilutive securities	—		352	—
Net income available for common stock and common stock equivalents	$	118,130	53,210	$	2.22

	Six Months Ended June 30, 2018
	Income		Shares	Per Share Amount
	(Thousands, except per share amounts)
Basic EPS Calculation
Net income available for common stock	$	111,254	52,648	$	2.11
Diluted EPS Calculation
Effect of dilutive securities	—		250
Net income available for common stock and common stock equivalents	$	111,254	52,898	$	2.10