Debt Annual interest rate (Details)	Mar. 31, 2013
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.50%
Connecticut Statutory Trust I [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	0.00%
Connecticut Statutory Trust II [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	0.00%
Connecticut Statutory Trust III [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	0.00%
Delaware Statutory Trust III [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	0.00%
Delaware Statutory Trust IV [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	0.00%
Delaware Statutory Trust VI [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	0.00%