PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Multiemployer Plan, Period Contributions	$ 1,754		$ 1,230		$ 1,147
AMO Pension Plan [Member]
Employer Identification and Pension Plan Number	13-1936709
Multiemployer Plans, Certified Zone Status	Yellow	[1]	Red	[1]
Multiemployer Plans, Funding Improvement Plan and Rehabilitation Plan	Implemented
Multiemployer Plan, Period Contributions	890		805		773
MEBA Pension Plan [Member]
Employer Identification and Pension Plan Number	51-6029896
Multiemployer Plans, Certified Zone Status	Green	[1]	Green	[1]
Multiemployer Plan, Period Contributions	448		0		0
Seafarers Pension Plan [Member]
Employer Identification and Pension Plan Number	13-6100329
Multiemployer Plans, Certified Zone Status	Green	[1]	Green	[1]
Multiemployer Plan, Period Contributions	$ 416		$ 425		$ 374

[1] A “Red” Zone Status plan is a plan that is funded 65% or less and currently has a funding deficiency or a funding deficiency that is projected in the near term. A “Yellow” Zone Status plan is a plan that is greater than 65% but less than 80% funded. A “Green” Zone Status plan is a plan that is 80% funded or more.