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Commitments and Contingencies - Leases (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Commitments and Contingencies Disclosure [Abstract]
Rental expense for period	$ 1,947,000	$ 1,982,000	$ 1,922,000
2013	1,941,000
2014	1,897,000
2015	1,719,000
2016	1,272,000
2017	883,000
Thereafter	3,870,000
Total future minimum lease payments	$ 11,582,000

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