EMPLOYEE BENEFIT PLANS (Details 7) (Pension Plan, USD $) In Thousands, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Employee Benefit Plans
Defined benefit plan, fair value of plan assets	$ 55,390		$ 46,192		$ 43,982
Quoted Prices In Active Markets For Identical Assets (Level 1)
Employee Benefit Plans
Defined benefit plan, fair value of plan assets	16,862		14,430
Significant Observable Inputs (Level 2)
Employee Benefit Plans
Defined benefit plan, fair value of plan assets	38,528		31,762
Cash And Cash Equivalents | Quoted Prices In Active Markets For Identical Assets (Level 1)
Employee Benefit Plans
Defined benefit plan, fair value of plan assets	652		467
Equity securities | U.S. large-cap growth | Quoted Prices In Active Markets For Identical Assets (Level 1)
Employee Benefit Plans
Defined benefit plan, fair value of plan assets	6,210	[1]	5,404	[1]
Equity securities | U.S. large-cap value | Quoted Prices In Active Markets For Identical Assets (Level 1)
Employee Benefit Plans
Defined benefit plan, fair value of plan assets	8,219	[1]	6,744	[1]
Fixed Income Securities | Maximum
Employee Benefit Plans
Percentage of securities below investment grade	5.00%
Fixed Income Securities | U.S. Treasury securities | Quoted Prices In Active Markets For Identical Assets (Level 1)
Employee Benefit Plans
Defined benefit plan, fair value of plan assets	1,781	[2]	1,815	[2]
Fixed Income Securities | Corporate bonds | Significant Observable Inputs (Level 2)
Employee Benefit Plans
Defined benefit plan, fair value of plan assets	2,266	[3]	2,093	[3]
Fixed Income Securities | Taxable municipal bonds | Significant Observable Inputs (Level 2)
Employee Benefit Plans
Defined benefit plan, fair value of plan assets	202	[3]	315	[3]
Fixed Income Securities | International bonds | Significant Observable Inputs (Level 2)
Employee Benefit Plans
Defined benefit plan, fair value of plan assets	579	[3]	528	[3]
Equity Mutual Funds | U.S. large-cap growth | Significant Observable Inputs (Level 2)
Employee Benefit Plans
Defined benefit plan, fair value of plan assets	3,458	[4]	3,902	[4]
Equity Mutual Funds | U.S. large-cap value | Significant Observable Inputs (Level 2)
Employee Benefit Plans
Defined benefit plan, fair value of plan assets	1,661	[4]	2,628	[4]
Equity Mutual Funds | U.S. large-cap blend | Significant Observable Inputs (Level 2)
Employee Benefit Plans
Defined benefit plan, fair value of plan assets	2,180	[3]
Equity Mutual Funds | U.S. mid-cap growth | Significant Observable Inputs (Level 2)
Employee Benefit Plans
Defined benefit plan, fair value of plan assets	4,497	[4]	3,688	[4]
Equity Mutual Funds | U.S. mid-cap value | Significant Observable Inputs (Level 2)
Employee Benefit Plans
Defined benefit plan, fair value of plan assets	4,439	[4]	3,782	[4]
Equity Mutual Funds | U.S. small-cap growth | Significant Observable Inputs (Level 2)
Employee Benefit Plans
Defined benefit plan, fair value of plan assets	1,099	[4]	1,887	[4]
Equity Mutual Funds | U.S. small-cap value | Significant Observable Inputs (Level 2)
Employee Benefit Plans
Defined benefit plan, fair value of plan assets	1,158	[4]	1,907	[4]
Equity Mutual Funds | U.S. small-cap blend | Significant Observable Inputs (Level 2)
Employee Benefit Plans
Defined benefit plan, fair value of plan assets	2,232	[3]
Equity Mutual Funds | International | Significant Observable Inputs (Level 2)
Employee Benefit Plans
Defined benefit plan, fair value of plan assets	5,185	[4]	5,513	[4]
Equity Mutual Funds | International small/mid-cap blend | Significant Observable Inputs (Level 2)
Employee Benefit Plans
Defined benefit plan, fair value of plan assets	1,686	[3]
Equity Mutual Funds | Emerging Markets | Significant Observable Inputs (Level 2)
Employee Benefit Plans
Defined benefit plan, fair value of plan assets	2,241	[4]	1,849	[4]
Fixed Income Mutual Funds | Corporate bonds | Significant Observable Inputs (Level 2)
Employee Benefit Plans
Defined benefit plan, fair value of plan assets	799	[4]	602	[4]
Fixed Income Mutual Funds | International bonds | Significant Observable Inputs (Level 2)
Employee Benefit Plans
Defined benefit plan, fair value of plan assets	262	[4]	242	[4]
Fixed Income Mutual Funds | Mortgage backed-securities | Significant Observable Inputs (Level 2)
Employee Benefit Plans
Defined benefit plan, fair value of plan assets	1,265	[4]	1,037	[4]
Fixed Income Mutual Funds | Short term investment grade bond | Significant Observable Inputs (Level 2)
Employee Benefit Plans
Defined benefit plan, fair value of plan assets	1,673	[3]
Fixed Income Mutual Funds | Intermediate investment grade bond | Significant Observable Inputs (Level 2)
Employee Benefit Plans
Defined benefit plan, fair value of plan assets	1,023	[4]	1,444	[4]
Fixed Income Mutual Funds | High yield bond | Significant Observable Inputs (Level 2)
Employee Benefit Plans
Defined benefit plan, fair value of plan assets	553	[4]	515	[4]
Stock Market Index Options | Puts | Significant Observable Inputs (Level 2)
Employee Benefit Plans
Defined benefit plan, fair value of plan assets	63	[5]	116	[5]
Stock Market Index Options | Calls | Significant Observable Inputs (Level 2)
Employee Benefit Plans
Defined benefit plan, fair value of plan assets	(53)	[5]	(361)	[5]
Accrued Income | Significant Observable Inputs (Level 2)
Employee Benefit Plans
Defined benefit plan, fair value of plan assets	$ 60	[6]	$ 75	[6]

[1] Equity securities include investments in publicly-traded common stock and preferred stock. Publicly-traded common stocks are traded on a national securities exchange and investments in common and preferred stocks are valued using quoted market prices multiplied by the number of shares owned.

[2] U.S. Treasury securities include agency and treasury debt. These investments are valued using dealer quotes in an active market.

[3] Bonds are valued utilizing a market approach that includes various valuation techniques and sources such as value generation models, broker quotes in active and non-active markets, benchmark yields and securities, reported trades, issuer spreads, and/or other applicable reference data. The corporate bonds and notes category is primarily comprised of U.S. dollar denominated, investment grade securities. Less than 5 percent of the securities have a rating below investment grade.

[4] Mutual funds are valued daily in actively traded markets by an independent custodian for the investment manager. For purposes of calculating the value, portfolio securities and other assets for which market quotes are readily available are valued at market value. Market value is generally determined on a basis of last reported sales prices, or if not sales are reported, based on quotes obtained from a quotation reporting system, established market makers, or pricing services. Investments initially valued in currencies other than the U.S. dollars are converted to the U.S. dollar using exchange rates obtained from pricing services.

[5] Options are valued utilizing a market approach that includes various valuation techniques and sources such as value generation models, broker quotes in active and non-active markets, reported trades, issuer spreads, and/or other applicable reference data.

[6] Accrued income represents dividends declared, but not received, on equity securities owned at December 31, 2012.