Commitments and Contingent Liabilities (Operating Leases) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2013	$ 3,245,000
2014	2,998,000
2015	2,573,000
2016	2,488,000
2017	1,766,000
Thereafter	9,308,000
Total future minimum payments due	22,378,000
Rent expense	2,800,000	2,000,000	1,400,000
Lease revenue	$ 1,600,000	$ 1,300,000	$ 1,300,000