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Accumulated Other Comprehensive Income Reclassifications from Accumulated Other Comprehensive Income (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Accumulated Other Comprehensive Income (Reclassification Out of AOCI) [Line Items]        
Selling, general and administrative expenses $ 2,271 $ 2,940 $ 5,085 $ 6,404
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member]
       
Accumulated Other Comprehensive Income (Reclassification Out of AOCI) [Line Items]        
Selling, general and administrative expenses     $ (55)