Stock Options and Restricted Stock (Details 1) (Stock Options [Member], USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Stock Options [Member]
Schedule of stock option activity
Beginning Balance, Number of shares	100,000	100,000	106,667
Grants, Number of shares
Exercises, Number of shares			(6,667)
Forfeitures, Number of shares
Ending Balance, Number of shares	100,000	100,000	100,000	106,667
Exercisable, Number of shares	100,000	100,000	100,000
Beginning Balance, Weighted-average exercise price	$ 107.28	$ 107.28	$ 104.81
Grants, Weighted-average exercise price
Exercises, Weighted-average exercise price			$ 67.84
Forfeitures, Weighted-average exercise price
Ending Balance, Weighted-average exercise price	$ 107.28	$ 107.28	$ 107.28	$ 104.81
Exercisable, Weighted-average exercise price	$ 107.28	$ 107.28	$ 107.28
Weighted-average remaining contractual life (yrs.)	1 month 6 days	1 year 1 month 6 days	2 years 1 month 6 days	2 years 10 months 24 days
Exercisable, Weighted-average remaining contractual life (yrs.)	1 month 6 days
Beginning Balance, Aggregate intrinsic value		$ 4,494	$ 11,489
Ending Balance, Aggregate intrinsic value			4,494	11,489
Exercisable, Aggregate intrinsic value

Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Net number of share options (or share units) granted during the period.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of options outstanding.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average price at which grantees can acquire the shares reserved for issuance on stock options awarded.

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Number of share options (or share units) exercised during the current period.

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