SHAREHOLDERS' EQUITY (SCHEDULE OF PERFORMANCE SHARE-BASED COMPENSATION) (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Shareholder Return Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Awards outstanding, beginning of period (in units)	549	519	382
Granted (in units)	254	258	142
Additional shares issued pursuant to achieving certain performance criteria (in units)	87	85	0
Vested (in units)	(261)	(260)	0
Forfeited (in units)	(59)	(53)	(5)
Awards outstanding, end of period (in units)	570	549	519
Performance unit payout	150.00%
Operating Return on Equity Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Awards outstanding, beginning of period (in units)	549	343	204
Granted (in units)	254	258	142
Additional shares issued pursuant to achieving certain performance criteria (in units)	65	0	0
Vested (in units)	(239)	0	0
Forfeited (in units)	(59)	(52)	(3)
Awards outstanding, end of period (in units)	570	549	343
Pre-Tax Operating Income Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Awards outstanding, beginning of period (in units)	0	176	470
Granted (in units)	0	0	0
Additional shares issued pursuant to achieving certain performance criteria (in units)	0	85	142
Vested (in units)	0	(260)	(434)
Forfeited (in units)	0	(1)	(2)
Awards outstanding, end of period (in units)	0	0	176