Stock Option Plans and Warrants (Stock Option and Restricted Stock Units Activity) (Details) (USD $)	3 Months Ended
Jun. 30, 2011	Mar. 31, 2011
Number of Options Outstanding, Beginning of period	1,352,504	1,300,400
Number of Options Granted	79,250	82,000
Number of Options Exercised	(5,062)	(13,063)
Number of Options Forfeited	(21,825)	(16,833)
Number of Options Outstanding, End of period	1,404,867	1,352,504
Number of Options Exercisable	1,111,625	1,080,512
Weighted-Average Exercise Price Outstanding, Beginning of period	$ 28.65	$ 29.06
Weighted-Average Exercise Price Granted	$ 11.02	$ 23.06
Weighted-Average Exercise Price Exercised	$ 1.13	$ 5.02
Weighted-Average Exercise Price Forfeited	$ 27.37	$ 27.75
Weighted-Average Exercise Price Outstanding, End of period	$ 27.77	$ 28.65
Weighted-Average Exercise Price Exercisable	$ 29.12	$ 29.43
Nonvested Restricted Stock Units [Member]
Number of Restricted Stock Nonvested, Beginning of period	54,976	79,150
Number of Restricted Stock Granted	28,685	378
Number of Restricted Stock Vested	(3,679)	(20,223)
Number of Restricted Stock Forfeited	(364)	(4,329)
Number of Restricted Stock Nonvested, End of period	79,618	54,976
Weighted-Average Grant Date Fair Value Nonvested, Beginning of period	$ 37.96	$ 35.82
Weighted-Average Grant Date Fair Value Granted	$ 11.53	$ 25.55
Weighted-Average Grant Date Fair Value Vested	$ 60.59	$ 30.42
Weighted-Average Grant Date Fair Value Forfeited	$ 32.06	$ 16.04
Weighted-Average Grant Date Fair Value Nonvested, End of period	$ 27.42	$ 37.96
Nonvested Restricted Stock [Member]
Number of Restricted Stock Nonvested, Beginning of period	77,535	46,001
Number of Restricted Stock Granted	7,583	40,035
Number of Restricted Stock Vested	0	(1,000)
Number of Restricted Stock Forfeited	0	(7,501)
Number of Restricted Stock Nonvested, End of period	85,118	77,535
Weighted-Average Grant Date Fair Value Nonvested, Beginning of period	$ 26.18	$ 29.84
Weighted-Average Grant Date Fair Value Granted	$ 11.25	$ 22.86
Weighted-Average Grant Date Fair Value Vested	$ 0.00	$ 35.01
Weighted-Average Grant Date Fair Value Forfeited	$ 0.00	$ 29.73
Weighted-Average Grant Date Fair Value Nonvested, End of period	$ 24.85	$ 26.18

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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The weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect during the reporting period as a result of the occurrence of a terminating event specified in the contractual agreement of the plan.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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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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The weighted average price at which option holders acquired shares when converting their stock options into shares under the plan during the reporting period.

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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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The weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated during the reporting period due to noncompliance with plan terms during the reporting period.

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

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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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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The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan.

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

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