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Stock-Based Compensation Plans and Employee Benefits (Details 2) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended | 3 Months Ended |  | 6 Months Ended |  | 3 Months Ended |  | 6 Months Ended |  | 6 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 Amended restricted stock units that vested on January 1, 2013 | Jun. 30, 2013 Performance-based restricted stock units | Jun. 30, 2013 Performance-based restricted stock units, vesting on December 31, 2013 | Jun. 30, 2013 Performance-based restricted stock units, vesting on December 31, 2014 | Jun. 30, 2013 Company's chairman and chief executive officer Restricted stock units | Jun. 30, 2013 Company's chairman and chief executive officer Performance-based restricted stock units | Jun. 30, 2013 Company's chairman and chief executive officer Service-based restricted stock units | Sep. 30, 2011 Executives and other officers Market-condition based restricted stock units granted on December 19, 2008, modified and measured on July 1, 2011 | Jun. 30, 2013 Executives and other officers Market-condition based restricted stock units granted on December 19, 2008, modified and measured on July 1, 2011 | Jun. 30, 2013 Employees Restricted stock units | Jun. 30, 2013 Employees Service-based restricted stock units vesting on February 11, 2013 | Jun. 30, 2013 Employees Annual incentive restricted stock units granted and vested to employees in February 2013 | Jun. 30, 2013 Employees Service-based restricted stock units | Jun. 30, 2013 Employees Service based restricted stock units with specified vesting dates | Jun. 30, 2013 Former director CSE and restricted stock units | Jun. 30, 2013 Directors CSE and restricted stock units | Jun. 30, 2013 Minimum Employees Performance-based restricted stock units | Jun. 30, 2013 Minimum Employees Service-based restricted stock units | Jun. 30, 2013 Minimum Employees Service based restricted stock units with specified vesting dates | Jun. 30, 2013 Maximum Employees Performance-based restricted stock units | Jun. 30, 2013 Maximum Employees Service-based restricted stock units | Jun. 30, 2013 Maximum Employees Service based restricted stock units with specified vesting dates
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vested (in shares) |  |  |  |  | 1,719,304 |  |  |  |  |  |  |  |  | 3,004,474 |  | 164,685 |  |  |  |  |  |  |  |  |  |
Amount RSU's issued net of statuatory minimum required tax witholdings (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,536,781 |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  |  |  | 600,000 | 313,334 |  |  |  |  | 185,720 |  | 197,564 |  | 33,474 | 316,548 |  |  |  |  |  |
Vesting term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year | 1 year |  | 3 years | 4 years
Performance measurement period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  | 2 years |  |
Vesting percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% |  |  | 200.00% |  |
Risk-free interest rate |  |  |  |  |  | 0.26% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected stock price volatility |  |  |  |  |  | 50.44% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares outstanding (in shares) |  |  |  |  |  |  | 97,835 | 195,672 |  |  | 600,000 |  | 1,686,303 |  |  |  |  | 143,998 |  |  |  |  |  |  |  |
Percentage of original units granted equal to amended units |  |  |  |  |  |  |  |  |  |  |  | 75.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted, fair value per share (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12.30 |  |  |  |  |  |  |
Shares issued for settlement (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 51,091 |  |  |  |  |  |  |
Aggregate intrinsic value for directors |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3.6 |  |  |  |  |  |
Gross contributions made by the Company | $ 0.1 | $ 0.1 | $ 0.7 | $ 0.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Represents the percentage applied to original units granted to determine the amended units in the situation where the minimum stock price, as defined in the plan, is not achieved by a certain date. + References No definition available. + Details
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- Definition The aggregate intrinsic value of outstanding equity awards on equity-based plans excluding option plans for which the Company is contingently obligated to issue equity instruments or transfer assets to an director as calculated by applying the disclosed pricing methodology. + References No definition available. + Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 11 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(c) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(b) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(a) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(b) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(a) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(d) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph e(2)(b) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph e(2)(d) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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