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Note 15 - Share-Based and Other Compensation Plans (RSUs - Equity Settled) (Details) | 12 Months Ended
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Dec. 31, 2015 $ / shares shares | Dec. 31, 2014 $ / shares shares | Dec. 31, 2013 shares | Dec. 31, 2012 shares
Timed-Vested RSUs [Member] | Equity Settled [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period (in years) | 3 years |  |  |
Restricted Stock Units (RSUs) [Member] | Equity Settled [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Grants by Compensation Committee | 612,881 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |
Unvested, Beginning of Period, Number of Shares | 2,056,596 |  |  |
Unvested, Beginning of Period, Weighted Average Grant-Date Fair Value Per Share | $ / shares | $ 10.65 |  |  |
Granted, Number of Shares | 612,881 |  |  |
Granted, Weighted Average Grant-Date Fair Value Per Share | $ / shares | $ 18.26 |  |  |
Vested, Number of Shares | (121,989) |  |  |
Vested, Weighted Average Grant-Date Fair Value Per Share | $ / shares | $ 5.83 |  |  |
Forfeited, Number of Shares | (74,627) |  |  |
Forfeited, Weighted Average Grant-Date Fair Value Per Share | $ / shares | $ 15.55 |  |  |
Unvested, End of Period, Number of Shares | 2,472,861 | 2,056,596 |  |
Unvested, End of Period, Weighted Average Grant-Date Fair Value Per Share | $ / shares | $ 12.62 | $ 10.65 |  |
2013 Award Year [Member] | Performance Based RSUs [Member] | Equity Settled [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Grants by Compensation Committee |  |  | 435,970 |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] |  |  |  |
Performance period |  |  | 3 years |
Risk-free interest rate |  |  | 0.40% |
Volatility |  |  | 81.80% |
Dividend yield |  |  | 0.07% |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |
Granted, Number of Shares |  |  | 435,970 |
2013 Award Year [Member] | Timed-Vested RSUs [Member] | Equity Settled [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Grants by Compensation Committee |  |  | 102,618 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |
Granted, Number of Shares |  |  | 102,618 |
2013 Award Year [Member] | Timed-Vested RSUs [Member] | Equity Settled [Member] | Key Employee [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Grants by Compensation Committee |  |  | 13,260 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |
Granted, Number of Shares |  |  | 13,260 |
2013 Award Year [Member] | Timed-Vested RSUs [Member] | Equity Settled [Member] | Non-Employee Directors [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Grants by Compensation Committee |  |  | 89,358 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |
Granted, Number of Shares |  |  | 89,358 |
2014 Award Year [Member] | Performance Based RSUs [Member] | Equity Settled [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Grants by Compensation Committee |  | 702,180 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] |  |  |  |
Performance period |  | 3 years |  |
Risk-free interest rate |  | 1.00% |  |
Volatility |  | 71.90% |  |
Dividend yield |  | 0.06% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |
Granted, Number of Shares |  | 702,180 |  |
2014 Award Year [Member] | Timed-Vested RSUs [Member] | Equity Settled [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Grants by Compensation Committee |  | 170,176 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |
Granted, Number of Shares |  | 170,176 |  |
2014 Award Year [Member] | Timed-Vested RSUs [Member] | Equity Settled [Member] | Key Employee [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Grants by Compensation Committee |  | 85,133 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |
Granted, Number of Shares |  | 85,133 |  |
2014 Award Year [Member] | Timed-Vested RSUs [Member] | Equity Settled [Member] | Non-Employee Directors [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Grants by Compensation Committee |  | 85,043 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |
Granted, Number of Shares |  | 85,043 |  |
2015 Award Year [Member] | Performance Based RSUs [Member] | Equity Settled [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Grants by Compensation Committee | 499,740 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] |  |  |  |
Performance period | 3 years |  |  |
Risk-free interest rate | 1.00% |  |  |
Volatility | 40.60% |  |  |
Dividend yield | 0.05% |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |
Granted, Number of Shares | 499,740 |  |  |
2015 Award Year [Member] | Timed-Vested RSUs [Member] | Equity Settled [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Grants by Compensation Committee | 113,141 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |
Granted, Number of Shares | 113,141 |  |  |
2015 Award Year [Member] | Timed-Vested RSUs [Member] | Equity Settled [Member] | Key Employee [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Grants by Compensation Committee | 56,970 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |
Granted, Number of Shares | 56,970 |  |  |
2015 Award Year [Member] | Timed-Vested RSUs [Member] | Equity Settled [Member] | Non-Employee Directors [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Grants by Compensation Committee | 56,171 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |
Granted, Number of Shares | 56,171 |  |  |
2014 and 2013 Award Years [Member] | Performance Based RSUs [Member] | Equity Settled [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Maximum Payout Percentage of Target Award | 200.00% |  |  |
Share Based Compensation, Maximum Multiplier for Target Payout | 6 |  |  |
Vesting period (in years) | 3 years |  |  |
Equity Compensation Plan, 2008 [Member] | Timed-Vested RSUs [Member] | Cash Settled [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period (in years) | 3 years | 3 years | 3 years |
Equity Compensation Plan, 2008 [Member] | 2013 Award Year [Member] | Performance Based RSUs [Member] | Equity Settled [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Maximum Payout Percentage of Target Award |  | 200.00% |  |
Share Based Compensation, Maximum Multiplier for Target Payout |  | 6 |  |
Vesting period (in years) |  | 3 years |  |
Equity Compensation Plan, 2008 [Member] | 2013 Award Year [Member] | Performance Based RSUs [Member] | Equity Settled [Member] | Maximum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Compensation Payout Percentage of Target Award When Absolute TSR is Negative |  | 50.00% |  |
Equity Compensation Plan, 2008 [Member] | 2013 Award Year [Member] | Performance Based RSUs [Member] | Cash Settled [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Grants by Compensation Committee |  | 0 | 0 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |
Granted, Number of Shares |  | 0 | 0 |
Equity Compensation Plan, 2008 [Member] | 2013 Award Year [Member] | Timed-Vested RSUs [Member] | Cash Settled [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Grants by Compensation Committee | 0 | 1,470 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |
Granted, Number of Shares | 0 | 1,470 |  |
Equity Compensation Plan, 2008 [Member] | 2014 Award Year [Member] | Performance Based RSUs [Member] | Cash Settled [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Grants by Compensation Committee | 0 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |
Granted, Number of Shares | 0 |  |  |
Equity Compensation Plan, 2008 [Member] | 2012 Award Year [Member] | Performance Based RSUs [Member] | Cash Settled [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Grants by Compensation Committee |  |  |  | 2,211,640
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |
Granted, Number of Shares |  |  |  | 2,211,640
Equity Compensation Plan, 2008 [Member] | 2012 Award Year [Member] | Timed-Vested RSUs [Member] | Cash Settled [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Grants by Compensation Committee |  |  | 7,670 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |
Granted, Number of Shares |  |  | 7,670 |

X
- Definition The maximum multiplier that can be used against a grantee's total award to calculate the target value of a share-based compensation award. This calculated value (the multiplier times the grantee's total award value on the grant date) represents the maximum payout in dollars allowed under the plan. + References No definition available. + Details
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- Definition Share-based Compensation Payout Percentage of Target Award When Absolute TSR (Total Stockholder Return measured relative to the peer group company's TSR) is Negative. + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Performance Period + References No definition available. + Details
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- Definition 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. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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 as a result of the occurrence of a terminating event. + 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)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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). + 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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). + 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + 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)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition 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. + 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)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + 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)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + 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)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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 (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + 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 (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + 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 (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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