Annual report pursuant to Section 13 and 15(d)

NATURE OF OPERATIONS AND ACCOUNTING POLICIES Nature of Operations Narrative (Details)

v2.4.1.9
NATURE OF OPERATIONS AND ACCOUNTING POLICIES Nature of Operations Narrative (Details) (USD $)
In Millions, except Share data, unless otherwise specified
0 Months Ended
Jan. 31, 2013
Jan. 31, 2013
stock_class
Recapitalization [Line Items]    
Newly issued common stock 19,883,583us-gaap_StockIssuedDuringPeriodSharesNewIssues  
Common stock, par value $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Number of stock classes 1era_NumberofClassesofStock 1era_NumberofClassesofStock
Series A Preferred Stock [Member]    
Recapitalization [Line Items]    
Value of preferred stock outstanding $ 140.0us-gaap_PreferredStockValueOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
$ 140.0us-gaap_PreferredStockValueOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
Preferred stock percentage 6.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember