RETIREMENT BENEFITS (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended																															12 Months Ended					12 Months Ended
	Dec. 31, 2011 Pensions Y count	Dec. 31, 2010 Pensions	Dec. 31, 2009 Pensions	Dec. 31, 2011 Pensions Short term investments	Dec. 31, 2010 Pensions Short term investments	Dec. 31, 2011 Pensions U.S. equity	Dec. 31, 2010 Pensions U.S. equity	Dec. 31, 2011 Pensions International equity	Dec. 31, 2010 Pensions International equity	Dec. 31, 2011 Pensions Common collective trust	Dec. 31, 2010 Pensions Common collective trust	Dec. 31, 2011 Pensions U.S. government debt	Dec. 31, 2011 Pensions U.S. corporate debt	Dec. 31, 2011 Pensions Equity long/short hedge funds	Dec. 31, 2010 Pensions Equity long/short hedge funds	Dec. 31, 2011 Pensions Quoted Prices in Active Markets for Identical Assets (Level 1)	Dec. 31, 2010 Pensions Quoted Prices in Active Markets for Identical Assets (Level 1)	Dec. 31, 2011 Pensions Quoted Prices in Active Markets for Identical Assets (Level 1) U.S. equity	Dec. 31, 2010 Pensions Quoted Prices in Active Markets for Identical Assets (Level 1) U.S. equity	Dec. 31, 2011 Pensions Quoted Prices in Active Markets for Identical Assets (Level 1) International equity	Dec. 31, 2010 Pensions Quoted Prices in Active Markets for Identical Assets (Level 1) International equity	Dec. 31, 2011 Pensions Quoted Prices in Active Markets for Identical Assets (Level 1) U.S. government debt	Dec. 31, 2011 Pensions Significant Other Observable Inputs (Level 2)	Dec. 31, 2010 Pensions Significant Other Observable Inputs (Level 2)	Dec. 31, 2011 Pensions Significant Other Observable Inputs (Level 2) Short term investments	Dec. 31, 2010 Pensions Significant Other Observable Inputs (Level 2) Short term investments	Dec. 31, 2011 Pensions Significant Other Observable Inputs (Level 2) Common collective trust	Dec. 31, 2010 Pensions Significant Other Observable Inputs (Level 2) Common collective trust	Dec. 31, 2011 Pensions Significant Other Observable Inputs (Level 2) U.S. corporate debt	Dec. 31, 2011 Pensions Significant Unobservable Inputs (Level 3)	Dec. 31, 2010 Pensions Significant Unobservable Inputs (Level 3)	Dec. 31, 2011 Pensions Significant Unobservable Inputs (Level 3) Equity long/short hedge funds	Dec. 31, 2010 Pensions Significant Unobservable Inputs (Level 3) Equity long/short hedge funds	Dec. 31, 2011 OPEB Y	Dec. 31, 2010 OPEB	Dec. 31, 2009 OPEB	Dec. 31, 2011 OPEB Maximum	Dec. 31, 2011 OPEB Minimum	Dec. 31, 2011 OPEB Fund assets	Dec. 31, 2010 OPEB Fund assets	Dec. 31, 2011 OPEB U.S. equity	Dec. 31, 2010 OPEB U.S. equity	Dec. 31, 2011 OPEB International equity	Dec. 31, 2010 OPEB International equity	Dec. 31, 2011 OPEB U.S. government debt	Dec. 31, 2010 OPEB U.S. government debt	Dec. 31, 2011 OPEB U.S. corporate debt	Dec. 31, 2010 OPEB U.S. corporate debt	Dec. 31, 2011 OPEB Foreign debt	Dec. 31, 2010 OPEB Foreign debt	Dec. 31, 2011 OPEB Cash and cash equivalents	Dec. 31, 2010 OPEB Cash and cash equivalents	Dec. 31, 2011 OPEB Mutual funds - fixed income	Dec. 31, 2010 OPEB Mutual funds - fixed income	Dec. 31, 2011 OPEB Mutual funds - equity	Dec. 31, 2010 OPEB Mutual funds - equity	Dec. 31, 2011 OPEB Accrued interest & dividends	Dec. 31, 2010 OPEB Accrued interest & dividends	Dec. 31, 2011 OPEB Quoted Prices in Active Markets for Identical Assets (Level 1) Fund assets	Dec. 31, 2010 OPEB Quoted Prices in Active Markets for Identical Assets (Level 1) Fund assets	Dec. 31, 2011 OPEB Quoted Prices in Active Markets for Identical Assets (Level 1) U.S. equity	Dec. 31, 2010 OPEB Quoted Prices in Active Markets for Identical Assets (Level 1) U.S. equity	Dec. 31, 2011 OPEB Quoted Prices in Active Markets for Identical Assets (Level 1) International equity	Dec. 31, 2010 OPEB Quoted Prices in Active Markets for Identical Assets (Level 1) International equity	Dec. 31, 2011 OPEB Quoted Prices in Active Markets for Identical Assets (Level 1) Cash and cash equivalents	Dec. 31, 2010 OPEB Quoted Prices in Active Markets for Identical Assets (Level 1) Cash and cash equivalents	Dec. 31, 2011 OPEB Quoted Prices in Active Markets for Identical Assets (Level 1) Mutual funds - fixed income	Dec. 31, 2010 OPEB Quoted Prices in Active Markets for Identical Assets (Level 1) Mutual funds - fixed income	Dec. 31, 2011 OPEB Quoted Prices in Active Markets for Identical Assets (Level 1) Mutual funds - equity	Dec. 31, 2010 OPEB Quoted Prices in Active Markets for Identical Assets (Level 1) Mutual funds - equity	Dec. 31, 2011 OPEB Significant Other Observable Inputs (Level 2) Fund assets	Dec. 31, 2010 OPEB Significant Other Observable Inputs (Level 2) Fund assets	Dec. 31, 2011 OPEB Significant Other Observable Inputs (Level 2) U.S. government debt	Dec. 31, 2010 OPEB Significant Other Observable Inputs (Level 2) U.S. government debt	Dec. 31, 2011 OPEB Significant Other Observable Inputs (Level 2) U.S. corporate debt	Dec. 31, 2010 OPEB Significant Other Observable Inputs (Level 2) U.S. corporate debt	Dec. 31, 2011 OPEB Significant Other Observable Inputs (Level 2) Foreign debt	Dec. 31, 2010 OPEB Significant Other Observable Inputs (Level 2) Foreign debt
Fair value measurements of plan assets
Period over which the market-related value is determined (in years)	5
Number of basic elements on which primary investment goals of the company for pension fund assets are based (in counts)	4
Target allocations for plan assets
Equity securities, minimum (as a percent)	60.00%																																	40.00%
Equity securities, maximum (as a percent)	80.00%																																	60.00%
Debt securities, minimum (as a percent)	20.00%																																	40.00%
Debt securities, maximum (as a percent)	40.00%																																	60.00%
Minimum target allocations for other types of investments (as a percent)	0.00%
Maximum target allocations for other types of investments (as a percent)	15.00%
Cash and cash equivalents (as a percent)																																					10.00%	0.00%
Fund assets measured at fair value
Fair value of plan assets	$ 140,975		$ 107,076	$ 1,787	$ 1,387	$ 57,228	$ 47,797	$ 19,151	$ 15,876	$ 22,904	$ 32,955	$ 794	$ 11,692	$ 27,419	$ 22,338	$ 77,173	$ 63,673	$ 57,228	$ 47,797	$ 19,151	$ 15,876	$ 794	$ 36,383	$ 34,342	$ 1,787	$ 1,387	$ 22,904	$ 32,955	$ 11,692	$ 27,419	$ 22,338	$ 27,419	$ 22,338	$ 58,384		$ 50,036			$ 58,113	$ 56,482	$ 21,080	$ 17,592	$ 1,784	$ 1,274	$ 1,839	$ 4,091	$ 17,232	$ 15,156	$ 1,460	$ 420	$ 1,536	$ 3,897	$ 2,107	$ 1,496	$ 11,075	$ 12,556	$ 271	$ 248	$ 37,582	$ 36,815	$ 21,080	$ 17,592	$ 1,784	$ 1,274	$ 1,536	$ 3,897	$ 2,107	$ 1,496	$ 11,075	$ 12,556	$ 20,531	$ 19,667	$ 1,839	$ 4,091	$ 17,232	$ 15,156	$ 1,460	$ 420
Percentage of Plan Assets	100.00%	100.00%		1.20%	1.10%	40.60%	39.70%	13.60%	13.20%	16.30%	27.40%	0.60%	8.30%	19.40%	18.60%																			100.00%	100.00%						36.10%	31.00%	3.10%	2.20%	3.00%	7.20%	29.50%	26.70%	2.50%	0.70%	2.60%	7.00%	3.60%	2.60%	19.00%	22.10%	0.50%	0.50%
Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
Fair value of plan assets at beginning of year	120,353		107,076	1,787	1,387	57,228	47,797	19,151	15,876	22,904	32,955	794	11,692	27,419	22,338	77,173	63,673	57,228	47,797	19,151	15,876	794	36,383	34,342	1,787	1,387	22,904	32,955	11,692	27,419	22,338	22,338	23,515	56,730		50,036			58,113	56,482	21,080	17,592	1,784	1,274	1,839	4,091	17,232	15,156	1,460	420	1,536	3,897	2,107	1,496	11,075	12,556	271	248	37,582	36,815	21,080	17,592	1,784	1,274	1,536	3,897	2,107	1,496	11,075	12,556	20,531	19,667	1,839	4,091	17,232	15,156	1,460	420
Actual return on plan assets:
Relating to assets still held at the reporting date																																(669)	1,423
Purchases																																5,750
Sales																																	(2,600)
Fair value of plan assets at end of year	$ 140,975		$ 107,076	$ 1,787	$ 1,387	$ 57,228	$ 47,797	$ 19,151	$ 15,876	$ 22,904	$ 32,955	$ 794	$ 11,692	$ 27,419	$ 22,338	$ 77,173	$ 63,673	$ 57,228	$ 47,797	$ 19,151	$ 15,876	$ 794	$ 36,383	$ 34,342	$ 1,787	$ 1,387	$ 22,904	$ 32,955	$ 11,692	$ 27,419	$ 22,338	$ 27,419	$ 22,338	$ 58,384		$ 50,036			$ 58,113	$ 56,482	$ 21,080	$ 17,592	$ 1,784	$ 1,274	$ 1,839	$ 4,091	$ 17,232	$ 15,156	$ 1,460	$ 420	$ 1,536	$ 3,897	$ 2,107	$ 1,496	$ 11,075	$ 12,556	$ 271	$ 248	$ 37,582	$ 36,815	$ 21,080	$ 17,592	$ 1,784	$ 1,274	$ 1,536	$ 3,897	$ 2,107	$ 1,496	$ 11,075	$ 12,556	$ 20,531	$ 19,667	$ 1,839	$ 4,091	$ 17,232	$ 15,156	$ 1,460	$ 420
Cash equivalent securities, maximum maturity period (in years)																																		1