STOCK-BASED COMPENSATION (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued to employees	72,760,969	72,932,222
Aggregate Intrinsic Value
Proceeds received upon exercise of stock options		$ 6
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	5 years
Expiration term	10 years
Shares issued to employees	0	1,000
Exercised (in shares)		(1,000)	(32,000)
Options activity outstanding of stock option plan
Balance outstanding at the beginning of the period (in shares)		1,000	33,000
Exercised (in shares)		(1,000)	(32,000)
Balance outstanding at the end of the period (in shares)			1,000
Weighted-Average Exercise Price
Balance at the beginning of the period (in dollars per share)		$ 5.52	$ 5.26
Exercised (in dollars per share)			$ 5.25
Exercisable (in dollars per share)
Balance at the end of the period (in dollars per share)			$ 5.52
Weighted-Average Remaining Contractual Term
Balance at the beginning of the period		29 days	11 months 5 days
Balance at the end of the period		29 days	11 months 5 days
Aggregate Intrinsic Value
Balance at the beginning of the period		17	553
Balance at the end of the period			17
Time Lapse Restricted Shares Issued 2004 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	6 years
Shares issued to employees	400,000	500,000	800,000
Vesting increment, starting with the second anniversary, over six years (as a percent)	20.00%
Common stock reserved for issuance upon exercise of stock options (in shares)	5,700,000
Stock-based compensation expense
Pre-tax compensation expense	10,579	10,427	9,494
Tax benefit	(4,094)	(4,014)	(3,655)
Restricted stock expense, net of tax	6,485	6,413	5,839
Unrecognized compensation cost	$ 29,400	$ 30,700
Unrecognized compensation cost, period for recognition	3 years 7 months 12 days	3 years 8 months 18 days
Unvested restricted stock activity
Balance outstanding at the beginning of the period (in shares)	2,454,000	2,743,000	2,686,000
Forfeited (in shares)	(119,000)	(56,000)	(92,000)
Vested (in shares)	(679,000)	(696,000)	(627,000)
Granted (in shares)	411,000	463,000	776,000
Balance outstanding at the end of the period (in shares)	2,067,000	2,454,000	2,743,000
Weighted-Average Grant-Date Fair Value
Balance at the beginning of the period (in dollars per share)	$ 18.75	$ 16.41	$ 13.30
Forfeited (in dollars per share)	$ 21.40	$ 17.52	$ 16.41
Vested (in dollars per share)	$ 15.47	$ 13.34	$ 10.87
Granted (in dollars per share)	$ 28.74	$ 24.49	$ 22.69
Balance at the end of the period (in dollars per share)	$ 21.67	$ 18.75	$ 16.41