Accumulated Other Comprehensive Income Reclassifications from Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Accumulated Other Comprehensive Income Reclassifications from Accumulated Other Comprehensive Income [Line Items]
Selling, general and administrative expenses	$ 2,197	$ 3,381	$ 7,003	$ 8,466
Accumulated Net Unrealized Investment Gain (Loss) | Reclassification Out Of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income Reclassifications from Accumulated Other Comprehensive Income [Line Items]
Selling, general and administrative expenses			$ 541