Accumulated Other Comprehensive Income Reclassifications out of AOCI (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Selling, general and administrative expenses $ 10,851 $ 11,676
Accumulated Net Unrealized Investment Gain (Loss) | Reclassification out of Accumulated Other Comprehensive Income
   
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Selling, general and administrative expenses $ (296)