Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		3 Months Ended				6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Accumulated Net Unrealized Investment Gain (Loss) [Member]	Mar. 31, 2013 Accumulated Net Unrealized Investment Gain (Loss) [Member]	Jun. 30, 2013 Accumulated Translation Adjustment [Member]	Mar. 31, 2013 Accumulated Translation Adjustment [Member]	Jun. 30, 2013 Accumulated other comprehensive income
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance	$ 268,100		$ 295,271		$ 256,864	$ 282,503	$ 11,236	$ 12,768
Other Comprehensive Loss Net Of Tax	(141,981)	15,481	(169,152)	32,117	(142,922)	(25,639)	941	(1,532)	(169,152)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	126,119		126,119		113,942	256,864	12,177	11,236
Net realized investment gain	4,623	6,488	13,193	6,659
Income tax expense	1,619	2,271	4,618	2,331
Total reclassifications	$ 3,004	$ 4,217	$ 8,575	$ 4,328