STOCK-BASED COMPENSATION (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
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	0
Exercised (in shares)			(1,000)
Options activity outstanding of stock option plan
Balance outstanding at the beginning of the period (in shares)			1,000
Exercised (in shares)			(1,000)
Balance outstanding at the end of the period (in shares)
Weighted-Average Exercise Price
Balance at the beginning of the period (in dollars per share)			$ 3.68
Exercised (in dollars per share)			$ 3.68
Exercisable (in dollars per share)
Balance at the end of the period (in dollars per share)
Weighted-Average Remaining Contractual Term
Balance at the beginning of the period			29 days
Balance at the end of the period			29 days
Aggregate Intrinsic Value
Balance at the beginning of the period			$ 17
Balance at the end of the period
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	700,000	600,000	700,000
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)	5,100,000
Stock-based compensation expense
Pre-tax compensation expense	$ 12,110	$ 10,579	$ 10,427
Tax benefit	(4,687)	(4,094)	(4,014)
Restricted stock expense, net of tax	7,423	6,485	$ 6,413
Unrecognized compensation cost	$ 31,300	$ 29,400
Unrecognized compensation cost, period for recognition	3 years 9 months 18 days	3 years 8 months 12 days
Unvested restricted stock activity
Balance outstanding at the beginning of the period (in shares)	3,100,000	3,680,000	4,114,000
Forfeited (in shares)	(85,000)	(178,000)	(84,000)
Vested (in shares)	(946,000)	(1,018,000)	(1,045,000)
Granted (in shares)	682,000	616,000	695,000
Balance outstanding at the end of the period (in shares)	2,751,000	3,100,000	3,680,000
Weighted-Average Grant-Date Fair Value
Balance at the beginning of the period (in dollars per share)	$ 14.45	$ 12.50	$ 10.94
Forfeited (in dollars per share)	15.71	14.27	11.68
Vested (in dollars per share)	12.04	10.31	8.89
Granted (in dollars per share)	22.43	19.16	16.19
Balance at the end of the period (in dollars per share)	$ 17.21	$ 14.45	$ 12.50