Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Feb. 28, 2015	Feb. 28, 2014	Nov. 30, 2014
Debt Instrument [Line Items]
Net Income (Loss) Attributable to Parent	$ 7,799us-gaap_NetIncomeLoss	$ 10,563us-gaap_NetIncomeLoss
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	8,200,000	5,200,000
Less: Distributed earnings allocated to nonvested restricted stock	(9)	(5)
Numerator for basic earnings per share	7,770	10,536
Interest expense and amortization of debt issuance costs associated with convertible senior notes, net of taxes	667	667
Undistributed Earnings Allocated to Participating Securities	(20)	(22)
Less: Undistributed earnings reallocated to nonvested restricted stock	(18)	(20)
Numerator for diluted earnings per share	$ 8,439	$ 11,205
Weighted Average Number of Shares Outstanding, Basic	91,954,000	83,745,000
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	1,344,000	1,799,000
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities	8,402,000	8,402,000
Weighted Average Number of Shares Outstanding, Diluted	101,700,000	93,946,000
Earnings Per Share, Basic, in dollars per share	$ 0.08us-gaap_EarningsPerShareBasic	$ 0.13us-gaap_EarningsPerShareBasic
Earnings Per Share, Diluted, in dollars per share	$ 0.08us-gaap_EarningsPerShareDiluted	$ 0.12us-gaap_EarningsPerShareDiluted
Convertible Senior Notes Due Two Thousand Nineteen At One Point Three Seven Five Percent [Member] [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.375%
Convertible Notes Payable [Member] \| Convertible Senior Notes Due Two Thousand Nineteen At One Point Three Seven Five Percent [Member] [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.375%		1.375%
Debt Conversion, Converted Instrument, Shares Issued	36.5297
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities	8,401,831

Undistributed Earnings Reallocated to Participating Securities

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

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Contractual interest rate for funds borrowed, under the debt agreement.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of convertible debt securities using the if-converted method.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.

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Amount of undistributed earnings (loss) allocated to participating securities for the diluted earnings (loss) per share or per unit calculation under the two-class method.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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