Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (12,044)	[1]	$ 20,149	[1]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(32,159)	[1]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(34)	[1],[2]
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(32,193)	[1]	(4,984)		12,852
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(1,936)	[1]	(769)	[1]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(1,432)	[1]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	265	[1],[2]
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(1,167)	[1]
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(10,108)	[1]	20,918	[1]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(30,727)	[1]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(299)	[1],[2]
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	$ (31,026)	[1]

[1] (1) All amounts are net of tax. Amounts in parenthesis indicate debits.

[2] (2) See following table for details about these reclassifications.