Supplemental Comprehensive Income Disclosures (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning Balance			$ (20,588)	$ 1,259
Other comprehensive income (loss) before reclassification adjustment	6,471	(16,408)	14,567	(17,976)
Amounts reclassified from accumulated other comprehensive income (loss)			(1)	(5)
Total other comprehensive (loss) income	6,470	(16,410)	14,566	(17,981)
Accumulated Other Comprehensive Income (Loss), Ending Balance	(6,022)	(16,722)	(6,022)	(16,722)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning Balance			(20,868)	1,121
Other comprehensive income (loss) before reclassification adjustment			14,567	(17,976)
Amounts reclassified from accumulated other comprehensive income (loss)			(1)	(5)
Total other comprehensive (loss) income			14,566	(17,981)
Accumulated Other Comprehensive Income (Loss), Ending Balance	(6,302)	(16,860)	(6,302)	(16,860)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning Balance			280	138
Other comprehensive income (loss) before reclassification adjustment			0	0
Amounts reclassified from accumulated other comprehensive income (loss)			0	0
Total other comprehensive (loss) income			0	0
Accumulated Other Comprehensive Income (Loss), Ending Balance	280	138	280	138
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive (loss) income			$ 14,566	$ (17,981)