SHARE-BASED COMPENSATION - General (Details) $ / shares in Units, $ in Thousands		1 Months Ended				12 Months Ended
	Feb. 22, 2016 shares	Feb. 28, 2015 shares	Jan. 31, 2015 $ / shares shares	Jan. 31, 2014 shares	Feb. 28, 2013 shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 USD ($) item $ / shares shares	Dec. 31, 2013 USD ($) $ / shares shares	Feb. 28, 2018 shares	Feb. 28, 2017 shares	Sep. 03, 2015 shares
SHARE-BASED COMPENSATION
Share-based compensation expense | $						$ 13,748	$ 13,098	$ 10,008
Accrued compensation | $						$ 23,977	$ 18,673
Stock options
SHARE-BASED COMPENSATION
Vesting period							7 years
Granted (in shares)						250,000		0
Outstanding, end of period (in dollars per share) | $ / shares						$ 13.98	$ 13.66
Unrecognized compensation cost related to outstanding, unvested stock options and restricted stock | $						$ 1,900
Weighted average recognition period of unrecognized compensation cost						2 years 6 months
Expiration period of stock options							10 years
Weighted-average assumptions used and the weighted-average fair value per option granted
Expected life of stock option						7 years	7 years
Expected volatility (as a percent)						37.00%	36.00%
Risk-free interest rate (as a percent)						1.90%	2.10%
Dividend yield (as a percent)						2.30%	2.50%
Weighted average grant-date fair value (in dollars per share) | $ / shares						$ 5.20	$ 4.33
Shares
Outstanding, beginning of period (in shares)			2,351,000			2,351,000
Granted (in shares)						250,000		0
Exercised (in shares)						(382,000)
Forfeited and expired (in shares)						(386,000)
Outstanding, end of period (in shares)						1,833,000	2,351,000
Number of shares expected to vest						1,790,000
Options exercisable, end of period (in shares)						1,419,000
Weighted Average Exercise Price
Outstanding, beginning of period (in dollars per share) | $ / shares			$ 13.66			$ 13.66
Granted (in dollars per share) | $ / shares						16.55
Exercised (in dollars per share) | $ / shares						12.80
Forfeited and expired (in dollars per share) | $ / shares						14.85
Outstanding, end of period (in dollars per share) | $ / shares						13.98	$ 13.66
Options vested and expected to vest, end of period (in dollars per share) | $ / shares						13.97
Options exercisable, end of period (in dollars per share) | $ / shares						$ 13.90
Weighted Average Contractual Term
Outstanding, end of period						3 years 8 months 12 days
Options vested and expected to vest, end of period						3 years 6 months
Options exercisable, end of period						2 years 4 months 24 days
Aggregate Intrinsic Value
Outstanding, end of period | $						$ 1,298
Options vested and expected to vest, end of period | $						1,275
Options exercisable, end of period | $						$ 1,062
Other restricted stock awards
SHARE-BASED COMPENSATION
Number of shares vested						50,000
Shares outstanding						160,994	377,500
Restricted stock granted (in shares)						475,863	659,299
Other restricted stock awards | Maximum
SHARE-BASED COMPENSATION
Vesting period						3 years
Other restricted stock awards | Minimum
SHARE-BASED COMPENSATION
Vesting period						1 year
Other restricted stock awards | Year ended December 31, 2013 grants
SHARE-BASED COMPENSATION
Granted (in shares)								197,600
Shares
Granted (in shares)								197,600
Other restricted stock awards | Vest upon issuance | Year ended December 31, 2013 grants
SHARE-BASED COMPENSATION
Number of shares vested								164,100
Other restricted stock awards | Vest in one year | Year ended December 31, 2013 grants
SHARE-BASED COMPENSATION
Number of shares vested								33,500
Vesting period							1 year
Other restricted stock awards | Vest one to three years
SHARE-BASED COMPENSATION
Shares outstanding						110,994
Nonvested share awards
SHARE-BASED COMPENSATION
Restricted stock granted (in shares)						816,000
Weighted-average grant date fair value (in dollars per share) | $ / shares						$ 17.94	$ 15.05	$ 12.90
Remaining restricted stock (in shares)						709,000	578,000
Unrecognized compensation cost related to outstanding, unvested stock options and restricted stock | $						$ 7,200
Weighted average recognition period of unrecognized compensation cost						1 year 8 months 12 days
Shares
Vested (in shares)						(645,000)
2004 Incentive Plan
SHARE-BASED COMPENSATION
Equity awards (in shares)							7,500,000
Number of remaining shares available for issuance under current plan						500,000
Strategic Executive Incentive Plan
SHARE-BASED COMPENSATION
Granted (in shares)					330,000
Shares
Granted (in shares)					330,000
Strategic Executive Incentive Plan | 2014 Performance-based RSAs
SHARE-BASED COMPENSATION
Number of shares vested		225,000
Restricted stock granted (in shares)				450,000
Forfeited in the period							225,000
Number of executives who forfeited share awards in conjunction with resignation | item							2
2015 Inducement Plan
SHARE-BASED COMPENSATION
Number of remaining shares available for issuance under current plan											200,000
Stock awards issued during period						0
Executive performance-based annual incentive compensation awards | 2015 Performance-based RSAs
SHARE-BASED COMPENSATION
Number of shares vested	140,000
Restricted stock granted (in shares)		320,000
Executive performance-based annual incentive compensation awards | 2015 Performance-based RSAs | Vest one to three years
Shares
Number of shares expected to vest									0	180,000
Management performance based annual incentive compensation awards | 2015 Performance-based RSAs
SHARE-BASED COMPENSATION
Number of shares vested						10,000
Restricted stock granted (in shares)			20,000
Forfeited in the period						10,000
Executive officer and employee incentive compensation awards | Vest one to three years | Maximum
SHARE-BASED COMPENSATION
Vesting period							3 years
Executive officer and employee incentive compensation awards | Vest one to three years | Minimum
SHARE-BASED COMPENSATION
Vesting period							1 year
Executive officer and employee incentive compensation awards | Other restricted stock awards
SHARE-BASED COMPENSATION
Granted (in shares)						314,869
Shares
Granted (in shares)						314,869
Executive officer and employee incentive compensation awards | 2015 Performance-based RSAs
SHARE-BASED COMPENSATION
Share-based compensation expense | $						$ 7,700
Executive officer and employee incentive compensation awards for fiscal 2013 and 2014 | Other restricted stock awards
SHARE-BASED COMPENSATION
Granted (in shares)							281,799
Shares
Granted (in shares)							281,799