Supplemental Comprehensive Income Disclosures Supplemental Comprehensive Income Disclosures (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive (loss) income, net	$ (20,588)	$ 1,259	$ 2,001	$ (2,458)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(22,742)	(423)	6,047
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	753	(125)	(1,420)
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Transition Asset (Obligation), Recognized in Net Periodic Benefit Cost, Net of Tax	0	1	1
Net (loss) gain, Net of Tax Amount	142	(195)	(169)
Total other comprehensive (loss) income, Net of Tax Amount	(21,847)	(742)	4,459
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive (loss) income, net	(20,868)	1,121	1,669	(2,958)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(22,742)	(423)	6,047
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	753	(125)	(1,420)
Total other comprehensive (loss) income, Net of Tax Amount	(21,989)	(548)	4,627
Other Postretirement Benefit Plans, Defined Benefit [Member]
Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive (loss) income, net	280	138	332	500
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Transition Asset (Obligation), Recognized in Net Periodic Benefit Cost, Net of Tax	0	1	1
Net (loss) gain, Net of Tax Amount	142	(195)	(169)
Total other comprehensive (loss) income, Net of Tax Amount	$ 142	$ (194)	$ (168)