Financial Instruments (Details) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Fair Value Disclosures [Abstract]
Accounts receivable, fair value	$ 88,900,000
Accounts receivable, carrying value	$ 99,951,000	$ 109,102,000

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. Amounts due from customers or clients for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, as well as any other amounts due from others, including related parties, which may be included in accounts receivable as categorized on the statement of financial position.

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