Nature of Operations and Significant Accounting Policies (Details) Accumulated Other Comprehensive Income (Loss) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Net unrealized appreciation on available-for-sale investments	$ 4,455,000	$ 4,681,000
Foreign currency translation	(6,469,000)	(5,640,000)
Accumulated other comprehensive income	(2,014,000)	(959,000)
Deferred income tax liability, other comprehensive income	2,400,000	2,500,000
Deferred income tax assets, other comprehensive loss	$ 3,300,000	$ 2,800,000