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Stock-Based Compensation (Details 6) (Stock Appreciation Rights (SARs) [Member], USD $) | 12 Months Ended
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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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- Definition Share based compensation arrangement by share based payment award non option equity instruments exercisable number. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award non option equity instruments exercisable weighted average exercise price. + References No definition available. + Details
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- Definition Number of non-option equity instruments exercised by participants. + References 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 + Details
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- Definition Number of shares under non-option equity instrument agreements that were either cancelled or expired. + References 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)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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