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Note 6 - Investments Investment Income (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net Investment Income [Line Items]
Investment Income, Gross	$ 70,733rdn_InvestmentIncomeGross	$ 74,948rdn_InvestmentIncomeGross	$ 78,473rdn_InvestmentIncomeGross
Investment Income, Investment Expense	(5,078)	(6,827)	(5,794)
Investment Income, Net	65,655us-gaap_InvestmentIncomeNet	68,121us-gaap_InvestmentIncomeNet	72,679us-gaap_InvestmentIncomeNet
Fixed Maturities [Member]
Net Investment Income [Line Items]
Investment Income, Gross	62,352	66,131	66,518
Equity Securities [Member]
Net Investment Income [Line Items]
Investment Income, Gross	6,287	6,592	7,738
Short-term Investments [Member]
Net Investment Income [Line Items]
Investment Income, Gross	246	255	304
Other Security Investments [Member]
Net Investment Income [Line Items]
Investment Income, Gross	$ 1,848	$ 1,970	$ 3,913