SHARE-BASED COMPENSATION (Details 2) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended			6 Months Ended
	Feb. 20, 2015	Jan. 28, 2014	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
SHARE-BASED COMPENSATION
Share-based compensation expense			$ 5,305		$ 737	$ 6,926	$ 4,276
Other current assets			649			649		$ 71
Accrued compensation			23,248			23,248		$ 18,673
Nonvested share awards
SHARE-BASED COMPENSATION
Unrecognized compensation cost related to outstanding, unvested stock options and restricted stock			$ 10,000			$ 10,000
Weighted average recognition period of unrecognized compensation cost						2 years 2 months 12 days
2015 Performance-based RSAs
SHARE-BASED COMPENSATION
Restricted stock granted (in shares)						340,000
Weighted-average grant date fair value (in dollars per share)						$ 18.17
2015 Performance-based RSAs | Minimum
SHARE-BASED COMPENSATION
Vesting period						1 year
2015 Performance-based RSAs | Maximum
SHARE-BASED COMPENSATION
Vesting period						3 years
Service RSAs
SHARE-BASED COMPENSATION
Restricted stock granted (in shares)						150,000
Weighted-average grant date fair value (in dollars per share)						$ 17.01
Service RSAs | Minimum
SHARE-BASED COMPENSATION
Vesting period						1 year
Service RSAs | Maximum
SHARE-BASED COMPENSATION
Vesting period						3 years
Stock options
SHARE-BASED COMPENSATION
Awards forfeited (in shares)						1,899
Granted (in shares)			175,000	0
Stock option exercises (in shares)						114,418
Intrinsic value of stock options exercised						$ 600
Proceeds from stock options exercised						1,300
Receivable from stock options exercised			$ 200			200
Deferred Tax Expense from Stock Options Exercised						$ 1,700
Weighted Average Exercise Price (in dollars per share)			$ 17.77			$ 17.77
Unrecognized compensation cost related to outstanding, unvested stock options and restricted stock			$ 2,200			$ 2,200
Weighted average recognition period of unrecognized compensation cost						2 years 9 months 18 days
Weighted-average assumptions used and the weighted-average fair value per option granted
Expected life of stock option			7 years
Expected volatility (as a percent)			37.00%
Risk-free interest rate (as a percent)			1.85%
Dividend yield (as a percent)			2.30%
Weighted average grant-date fair value (in dollars per share)			$ 5.57
2004 Plan
SHARE-BASED COMPENSATION
Number of remaining shares available for issuance under current plan			634,699			634,699
Strategic Executive Incentive Plan | 2014 Performance-based RSAs | Vest one year after and upon certification of achievement of performance criteria by the compensation committee of the Board
SHARE-BASED COMPENSATION
Restricted stock granted (in shares)		225,000
Weighted-average grant date fair value (in dollars per share)		$ 15.02
Executive officer and employee incentive compensation awards
SHARE-BASED COMPENSATION
Share-based compensation expense			$ 3,100			$ 4,100
Executive officer and employee incentive compensation awards | Share awards
SHARE-BASED COMPENSATION
Restricted stock granted (in shares)	314,869
Weighted-average grant date fair value (in dollars per share)	$ 18.28