Basis of Presentation (Details) Accumulated Other Comprehensive Income (USD $)	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss), Net of Tax
Net unrealized appreciation on available-for-sale investments	$ 6,862,000	$ 6,862,000	$ 4,455,000
Foreign currency translation	(6,577,000)	(6,577,000)	(6,469,000)
Accumulated other comprehensive loss	285,000	285,000	(2,014,000)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	334,000	1,200,000
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax	346,000	893,000
Accumulated Net Unrealized Investment Gain (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax
Deferred tax liability on other comprehensive income	3,700,000	3,700,000	2,400,000
Accumulated Translation Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax
Deferred income tax asset on other comprehensive loss	$ 3,400,000	$ 3,400,000	$ 3,300,000