Stockholders' Equity (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Reclassifications included in net income:
Net of tax	$ 11,186
Reclassifications from accumulated other comprehensive income
Reclassifications included in net income:
Pre-tax	9,235
Tax (expense) benefit	1,951
Net of tax	11,186
Realized gain on sale of available for sale investment securities
Reclassifications included in net income:
Net of tax	9,120
Realized gain on sale of available for sale investment securities | Investment and other income | Reclassifications from accumulated other comprehensive income
Reclassifications included in net income:
Pre-tax	14,417
Tax (expense) benefit	(5,297)
Net of tax	9,120
Valuation allowance
Reclassifications included in net income:
Net of tax	5,307
Valuation allowance | Provision for income taxes | Reclassifications from accumulated other comprehensive income
Reclassifications included in net income:
Tax (expense) benefit	5,307
Net of tax	5,307
Amortization of pension and postretirement benefits
Reclassifications included in net income:
Net of tax	(3,241)
Amortization of pension and postretirement benefits | Underwriting and distribution expense and Compensation and related costs | Reclassifications from accumulated other comprehensive income
Reclassifications included in net income:
Pre-tax	(5,182)
Tax (expense) benefit	1,941
Net of tax	$ (3,241)