RETIREMENT BENEFITS (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended																	12 Months Ended																					12 Months Ended																	12 Months Ended								12 Months Ended
	Dec. 31, 2012 Pensions count	Dec. 31, 2011 Pensions	Dec. 31, 2010 Pensions	Dec. 31, 2012 Pensions Short term investments	Dec. 31, 2011 Pensions Short term investments	Dec. 31, 2012 Pensions U.S. equity	Dec. 31, 2011 Pensions U.S. equity	Dec. 31, 2012 Pensions International equity	Dec. 31, 2011 Pensions International equity	Dec. 31, 2012 Pensions Common collective trust	Dec. 31, 2011 Pensions Common collective trust	Dec. 31, 2012 Pensions U.S. government debt	Dec. 31, 2011 Pensions U.S. government debt	Dec. 31, 2012 Pensions U.S. corporate debt	Dec. 31, 2011 Pensions U.S. corporate debt	Dec. 31, 2012 Pensions Equity long/short hedge funds	Dec. 31, 2011 Pensions Equity long/short hedge funds	Dec. 31, 2012 Pensions Debt securities	Dec. 31, 2012 Pensions Equity securities	Dec. 31, 2012 Pensions Other types of investments	Dec. 31, 2012 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)	Dec. 31, 2012 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) U.S. equity	Dec. 31, 2012 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) International equity	Dec. 31, 2012 Pensions Quoted Prices in Active Markets for Identical Assets (Level 1) U.S. government debt	Dec. 31, 2011 Pensions Quoted Prices in Active Markets for Identical Assets (Level 1) U.S. government debt	Dec. 31, 2012 Pensions Significant Other Observable Inputs (Level 2)	Dec. 31, 2011 Pensions Significant Other Observable Inputs (Level 2)	Dec. 31, 2012 Pensions Significant Other Observable Inputs (Level 2) Short term investments	Dec. 31, 2011 Pensions Significant Other Observable Inputs (Level 2) Short term investments	Dec. 31, 2012 Pensions Significant Other Observable Inputs (Level 2) Common collective trust	Dec. 31, 2011 Pensions Significant Other Observable Inputs (Level 2) Common collective trust	Dec. 31, 2012 Pensions Significant Other Observable Inputs (Level 2) U.S. corporate debt	Dec. 31, 2011 Pensions Significant Other Observable Inputs (Level 2) U.S. corporate debt	Dec. 31, 2012 Pensions Significant Unobservable Inputs (Level 3)	Dec. 31, 2011 Pensions Significant Unobservable Inputs (Level 3)	Dec. 31, 2012 Pensions Significant Unobservable Inputs (Level 3) Equity long/short hedge funds	Dec. 31, 2011 Pensions Significant Unobservable Inputs (Level 3) Equity long/short hedge funds	Dec. 31, 2012 OPEB	Dec. 31, 2011 OPEB	Dec. 31, 2010 OPEB	Dec. 31, 2012 OPEB Fund assets	Dec. 31, 2011 OPEB Fund assets	Dec. 31, 2012 OPEB U.S. equity	Dec. 31, 2011 OPEB U.S. equity	Dec. 31, 2012 OPEB International equity	Dec. 31, 2011 OPEB International equity	Dec. 31, 2012 OPEB U.S. government debt	Dec. 31, 2011 OPEB U.S. government debt	Dec. 31, 2012 OPEB U.S. corporate debt	Dec. 31, 2011 OPEB U.S. corporate debt	Dec. 31, 2012 OPEB Foreign debt	Dec. 31, 2011 OPEB Foreign debt	Dec. 31, 2012 OPEB Cash and cash equivalents	Dec. 31, 2011 OPEB Cash and cash equivalents	Dec. 31, 2012 OPEB Mutual funds - fixed income	Dec. 31, 2011 OPEB Mutual funds - fixed income	Dec. 31, 2012 OPEB Mutual funds - equity	Dec. 31, 2011 OPEB Mutual funds - equity	Dec. 31, 2012 OPEB Accrued interest & dividends	Dec. 31, 2011 OPEB Accrued interest & dividends	Dec. 31, 2012 OPEB Debt securities	Dec. 31, 2012 OPEB Equity securities	Dec. 31, 2012 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) Fund assets	Dec. 31, 2012 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) U.S. equity	Dec. 31, 2012 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) International equity	Dec. 31, 2012 OPEB Quoted Prices in Active Markets for Identical Assets (Level 1) U.S. government debt	Dec. 31, 2011 OPEB Quoted Prices in Active Markets for Identical Assets (Level 1) U.S. government debt	Dec. 31, 2012 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) Cash and cash equivalents	Dec. 31, 2012 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 - fixed income	Dec. 31, 2012 OPEB Quoted Prices in Active Markets for Identical Assets (Level 1) Mutual funds - equity	Dec. 31, 2011 OPEB Quoted Prices in Active Markets for Identical Assets (Level 1) Mutual funds - equity	Dec. 31, 2012 OPEB Significant Other Observable Inputs (Level 2) Fund assets	Dec. 31, 2011 OPEB Significant Other Observable Inputs (Level 2) Fund assets	Dec. 31, 2012 OPEB Significant Other Observable Inputs (Level 2) U.S. corporate debt	Dec. 31, 2011 OPEB Significant Other Observable Inputs (Level 2) U.S. corporate debt	Dec. 31, 2012 OPEB Significant Other Observable Inputs (Level 2) Foreign debt	Dec. 31, 2011 OPEB Significant Other Observable Inputs (Level 2) Foreign debt
Fair value measurements of plan assets
Period over which the market-related value is determined	5 years
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
Target allocation, minimum (as a percent)																		20.00%	60.00%	0.00%																																				0.00%								40.00%	40.00%
Target allocation, maximum (as a percent)																		40.00%	80.00%	15.00%																																				10.00%								60.00%	60.00%
Fund assets measured at fair value
Fair value of plan assets	$ 160,175		$ 120,353	$ 2,398	$ 1,787	$ 63,655	$ 57,228	$ 22,074	$ 19,151	$ 26,110	$ 22,904	$ 1,535	$ 794	$ 15,518	$ 11,692	$ 28,885	$ 27,419				$ 87,264	$ 77,173	$ 63,655	$ 57,228	$ 22,074	$ 19,151	$ 1,535	$ 794	$ 44,026	$ 36,383	$ 2,398	$ 1,787	$ 26,110	$ 22,904	$ 15,518	$ 11,692	$ 28,885	$ 27,419	$ 28,885	$ 27,419	$ 67,667	$ 58,384	$ 56,730	$ 67,836	$ 58,113	$ 20,795	$ 21,080	$ 1,548	$ 1,784	$ 729	$ 1,839	$ 19,437	$ 17,232	$ 2,250	$ 1,460	$ 895		$ 3,914	$ 2,107	$ 17,818	$ 11,075	$ 281	$ 271			$ 45,699	$ 39,421	$ 20,795	$ 21,080	$ 1,548	$ 1,784	$ 729	$ 1,839	$ 895	$ 1,536	$ 3,914	$ 2,107	$ 17,818	$ 11,075	$ 21,687	$ 18,692	$ 19,437	$ 17,232	$ 2,250	$ 1,460
Percentage of Plan Assets	100.00%	100.00%		1.50%	1.20%	39.70%	40.60%	13.80%	13.60%	16.30%	16.30%	1.00%	0.60%	9.70%	8.30%	18.00%	19.40%																								100.00%	100.00%				30.70%	36.10%	2.30%	3.10%	1.10%	3.10%	28.70%	29.50%	3.30%	2.50%	1.30%	2.60%	5.80%	3.60%	26.30%	19.00%	0.50%	0.50%
Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
Fair value of plan assets at beginning of year	140,975		120,353	2,398	1,787	63,655	57,228	22,074	19,151	26,110	22,904	1,535	794	15,518	11,692	28,885	27,419				87,264	77,173	63,655	57,228	22,074	19,151	1,535	794	44,026	36,383	2,398	1,787	26,110	22,904	15,518	11,692	28,885	27,419	27,419	22,338	67,667	58,384	56,730	67,836	58,113	20,795	21,080	1,548	1,784	729	1,839	19,437	17,232	2,250	1,460	1,536		3,914	2,107	17,818	11,075	281	271			45,699	39,421	20,795	21,080	1,548	1,784	729	1,839	895	1,536	3,914	2,107	17,818	11,075	21,687	18,692	19,437	17,232	2,250	1,460
Actual return on plan assets:
Relating to assets still held at the reporting date																																							1,466	(669)
Purchases																																								5,750
Fair value of plan assets at end of year	$ 160,175		$ 120,353	$ 2,398	$ 1,787	$ 63,655	$ 57,228	$ 22,074	$ 19,151	$ 26,110	$ 22,904	$ 1,535	$ 794	$ 15,518	$ 11,692	$ 28,885	$ 27,419				$ 87,264	$ 77,173	$ 63,655	$ 57,228	$ 22,074	$ 19,151	$ 1,535	$ 794	$ 44,026	$ 36,383	$ 2,398	$ 1,787	$ 26,110	$ 22,904	$ 15,518	$ 11,692	$ 28,885	$ 27,419	$ 28,885	$ 27,419	$ 67,667	$ 58,384	$ 56,730	$ 67,836	$ 58,113	$ 20,795	$ 21,080	$ 1,548	$ 1,784	$ 729	$ 1,839	$ 19,437	$ 17,232	$ 2,250	$ 1,460	$ 895		$ 3,914	$ 2,107	$ 17,818	$ 11,075	$ 281	$ 271			$ 45,699	$ 39,421	$ 20,795	$ 21,080	$ 1,548	$ 1,784	$ 729	$ 1,839	$ 895	$ 1,536	$ 3,914	$ 2,107	$ 17,818	$ 11,075	$ 21,687	$ 18,692	$ 19,437	$ 17,232	$ 2,250	$ 1,460