CAPITALIZATION (Details) (USD $) In Millions, except Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2011
Schedule of Capitalization, Long-term Debt [Line Items]
Ownership percentage in joint venture (in hundredths)	50.00%
Common Stock [Member]
Schedule of Capitalization, Equity [Line Items]
Common stock outstanding (in shares)	50,542,709
Common stock par value (in dollars per share)	$ 0
Berkshire [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Interest rate (in hundredths)	4.76%
Balance of debt repaid	$ 3.0
Credit Facility (EBL) [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Borrowings under the credit facility	63.0
Series A Senior Notes [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Interest rate (in hundredths)	7.23%
Balance of debt repaid	4.3
Series B Senior Notes [Member]
Schedule of Capitalization, Long-term Debt [Line Items]
Interest rate (in hundredths)	7.38%
Balance of debt repaid	$ 45.0