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STOCKHOLDERS' EQUITY (Details) - USD ($)		12 Months Ended
	Sep. 14, 2010	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Stock Based Compensation
Outstanding options at the end of the period (in shares)		0	0	0
Total charge to operations and other disclosure for all incentive plans, including the 200,000 Units, is as follows:
Share based compensation charged to operations		$ 2,334,000	$ 1,833,000	$ 1,440,000
Compensation costs related to non-vested awards that have not yet been recognized		$ 5,719,000
Approximate weighted average vesting period		2 years 1 month 6 days
Restricted stock grants
Stock Based Compensation
Vesting period		5 years
Summary of the activity of the incentive plans
Restricted stock grants		129,975	118,850	112,650
Per share grant price (in dollars per share)		$ 24.60	$ 20.54	$ 21.59
Deferred compensation to be recognized over vesting period		$ 3,197,000	$ 2,441,000	$ 2,432,000
Number of non-vested shares:
Non-vested beginning of period (in shares)		480,995	470,015	407,460
Grants (in shares)		129,975	118,850	112,650
Vested during period (in shares)		(72,215)	(101,300)	(50,095)
Forfeitures (in shares)			(6,570)
Non-vested end of period (in shares)		538,755	480,995	470,015
Other disclosures
Average per share value of non-vested shares (based on grant price) (in dollars per share)		$ 17.12	$ 14.55	$ 14.22
Value of stock vested during the period (based on grant price)		$ 612,000	$ 621,000	$ 876,000
Average value of shares forfeited (based on grant price) (in dollars per share)			$ 15.49
Total charge to operations and other disclosure for all incentive plans, including the 200,000 Units, is as follows:
Share based compensation charged to operations		2,204,000	$ 1,701,000	1,341,000
Restricted stock units
Total charge to operations and other disclosure for all incentive plans, including the 200,000 Units, is as follows:
Share based compensation charged to operations		$ 130,000	$ 132,000	$ 99,000
2012 Incentive Plan
Stock Based Compensation
Number of shares authorized for issuance		600,000
Shares issued pursuant to plan		358,475
Prior Incentive Plans
Summary of the activity of the incentive plans
Restricted stock grants		0
Number of non-vested shares:
Grants (in shares)		0
Non-vested end of period (in shares)		380,280
Pay-for-performance program
Total charge to operations and other disclosure for all incentive plans, including the 200,000 Units, is as follows:
Compensation costs related to non-vested awards that have not yet been recognized		$ 167,000
Pay-for-performance program | Restricted stock units
Stock Based Compensation
Vesting period	7 years
Number of share instruments vested since plan's inception		1
Number of shares to be issued for each unit outstanding on not satisfying performance criteria at June 30, 2017		0
Summary of the activity of the incentive plans
Restricted stock grants	200,000
Per share grant price (in dollars per share)	$ 11.74
Deferred compensation to be recognized over vesting period	$ 822,000
Number of non-vested shares:
Grants (in shares)	200,000
Vested during period (in shares)		0	0	0
Forfeitures (in shares)		0	0	0

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Represents the aggregate number of share instruments vested under a share-based compensation plan since inception.

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