Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Disclosure [Abstract]
Income tax expense (benefit)	$ (16,952)	$ 7,370	$ 4,960
Allocated to stockholders' equity, for unrealized holding gain/loss on debt and equity securities for financial reporting purposes	(237)	554	251
Allocated to stockholders' equity, for tax benefit of pension liabilities	5,824	(2,912)	(688)
Total income taxes	$ (11,365)	$ 5,012	$ 4,523