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Related Party Transactions (Details Textual) (USD $) In Thousands, unless otherwise specified	3 Months Ended				1 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 Corporate Joint Venture [Member]	Mar. 31, 2012 Corporate Joint Venture [Member]	Mar. 31, 2013 Dividend Income [Member]	Mar. 31, 2012 Dividend Income [Member]
Related Party Transaction (Textual) [Abstract]
Joint Venture	20.00%	20.00%	40.00%	40.00%
Dividend received					$ 4,000	$ 800
Related Party Transaction (Additional Textual) [Abstract]
Receipt from NISCO related to earnings	1,880
Receipt from NISCO related to return on Capital on investment made	2,120
Sales to related party	11,570	12,241
Total Purchases of materials	$ 690	$ 873

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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- Definition

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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