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Stock-Based Compensation (Details 6) (Stock Appreciation Rights (SARs) [Member], USD $)	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2010
Stock Appreciation Rights (SARs) [Member]
Changes in Stock appreciation rights
Number of options, Beginning balance	115,187		135,409	143,085
Weighted-average exercise price per share, Beginning balance	$ 20.00		$ 20.00	$ 20.00
Number of options, Granted		[1]
Number of options, Exercised
Number of SARs, Forfeited	(4,594)		(20,222)	(7,676)
Number of options, Ending balance	110,593		115,187	135,409
Weighted-average exercise price per share, Ending balance	$ 20.00		$ 20.00	$ 20.00
SARs Exercisable, Ending balance	110,593		115,187	135,409
Weighted-Average Exercise Price, Ending balance	$ 20.00		$ 20.00	$ 20.00
[1] Represents the present value of future minimum capital lease payments for equipment leased in the third quarter of 2012.

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Share based compensation arrangement by share based payment award non option equity instruments exercisable weighted average exercise price.

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Share based compensation arrangement by share based payment award non option equity instruments outstanding weighted average exercise price.

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Number of non-option equity instruments exercised by participants.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iv)(2)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Number of shares under non-option equity instrument agreements that were either cancelled or expired.

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-Publisher FASB

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-Topic 718

-SubTopic 10

-Section 50

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-Subparagraph (c)(1)(iv)(3)-(4)

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Net number of non-option equity instruments granted to participants.

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-SubTopic 10

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-Subparagraph (c)(1)(iv)(1)

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Number of shares reserved for issuance under non-option equity instrument agreements awarded that validly exist and are outstanding, including vested instruments.

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