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As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

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

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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 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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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable.

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The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date.

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As of the balance sheet date, the weighted-average exercise price (at which grantees can acquire the shares reserved for issuance) for exercisable stock options that are fully vested or expected to vest.

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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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The number of shares purchased on the open market during the period for issuance to employees under the plan.

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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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Stock Compensation - Options (Details Textual) (USD $)	3 Months Ended	9 Months Ended
Stock Compensation - Options (Details Textual) (USD $)	Sep. 30, 2012	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Stock Compensation - Options (Textual) [Abstract]
Options, Outstanding, Number	50,439	50,439		66,693
Options Granted		0
Stock Compensation - Options (Additional Textual) [Abstract]
Unrecognized compensation cost	$ 0	$ 0
Options vested	0	0
Fair value of options vested	0
Intrinsic value of options exercised		21,000	1,628,000
Options vested and exercisable	50,439	50,439
Exercisable with a weighted-average exercise price	$ 27.69	$ 27.69
Options exercisable	$ 118,000	$ 118,000
Maximum [Member]
Stock Compensation - Options (Textual) [Abstract]
Exercise prices for options outstanding	$ 27.90	$ 27.90
Minimum [Member]
Stock Compensation - Options (Textual) [Abstract]
Exercise prices for options outstanding	$ 27.66	$ 27.66
1998 Plan [Member]
Stock Compensation - Options (Textual) [Abstract]
Common stock under Stock Incentive Plan	2,350,000	2,350,000
Granted options under Stock Incentive Plan		1,129,292
Granted options outstanding		1,085,159
Vesting period of options granted		5 years
Vesting period of options contractual terms		10 years
Options Granted		0	0
NDSI Plan [Member]
Stock Compensation - Options (Textual) [Abstract]
Options exercised or forfeited		77,212
Vesting period of options granted		1 year
Vesting period of options contractual terms		10 years
Options Granted		0	0
Employee [Member] \| 1998 Plan [Member]
Stock Compensation - Options (Textual) [Abstract]
Options, Outstanding, Number	44,133	44,133
NDSI Plan [Member] \| NDSI Plan [Member]
Stock Compensation - Options (Textual) [Abstract]
Options, Outstanding, Number	6,306	6,306
Stock Options [Member] \| NDSI Plan [Member]
Stock Compensation - Options (Textual) [Abstract]
Common stock under Stock Incentive Plan	200,000	200,000
Granted options under Stock Incentive Plan		83,518