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Other Assets (Schedule of Other Assets) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Finite-Lived Intangible Assets [Line Items]
Patents, at cost	$ 5,021	$ 4,900
Deposits on capital items	3,934	1,618
Software development costs	2,057	2,057
Investment in equity securities, equity method	125	969
Investment in equity securities, carried at cost	1,206
Other	549	474
Other assets	9,568	7,289
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Accumulated amortization	(2,826)	(2,583)	(200)
Software development [Member]
Finite-Lived Intangible Assets [Line Items]
Accumulated amortization	$ (498)	$ (146)

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