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Share-Based Compensation (Details Textual) (USD $) | 3 Months Ended |  |  |  | 3 Months Ended | 1 Months Ended | 3 Months Ended | 1 Months Ended | 3 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2012 | Mar. 31, 2013 Performance unit incentive plan (PUP) [Member] | Mar. 31, 2012 Performance unit incentive plan (PUP) [Member] | Dec. 31, 2012 Performance unit incentive plan (PUP) [Member] | Mar. 31, 2013 Restricted stock units and performance based restricted stock units [Member] | Dec. 31, 2012 Restricted stock units and performance based restricted stock units [Member] | Mar. 31, 2013 Stock options [Member] | Feb. 28, 2013 Restricted Stock [Member] | Feb. 28, 2012 Restricted Stock [Member] | Mar. 31, 2013 Restricted Stock [Member] | Jan. 31, 2012 PBRS [Member] | Mar. 31, 2013 Restricted stock units [Member]
Share Based Compensation (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized cost |  |  |  |  |  |  |  |  |  |  |  | $ 5,900,000 |  |
Recognition Period of Unrecognized cost |  |  |  |  |  |  |  |  | 1 year |  |  | 2 years 2 months 12 days |  |
Repurchase of Common Stock for Employee Tax Withholding Obligations amount | 1,200,000 |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |
Repurchased shares tax withholding | 44,606 |  | 50,894 |  |  |  |  |  |  |  |  |  |  |
Shares Available for Grant | 1,001,609 |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities related to restricted stock |  |  |  |  |  |  | 421,000 | 633,000 |  |  |  |  |  |
Payments To Employees | 0 | 0 |  |  |  |  |  |  |  | 300,000 | 257,000 |  | 35,000 |
PUP award vested |  |  |  | 0 | 0 |  |  |  |  |  |  | 145,506 |  | 11,300
Total unrecognized cost related to non-vested stock option awards | 10,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options granted | 0 |  |  |  |  |  |  |  |  |  |  |  |  |
Liability awards recorded |  |  |  | $ 4,600,000 |  | $ 3,700,000 |  |  |  |  |  |  |  |

X
- Definition Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements. Represents currently earned compensation under compensation arrangements that is not actually paid until a later date. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements payable after one year (or the operating cycle, if longer). + References No definition available. + Details
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- Definition Aggregate cash paid by the entity during the period to settle equity instruments granted under equity-based payment arrangements. + 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 (k) -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 j -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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Period Type: | duration

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Aggregate unrecognized cost of share-based awards, other than options, made to employees under an equity-based compensation plan, that have yet to vest. + References No definition available. + Details
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- Definition Aggregate unrecognized cost of option awards made to employees under a stock option plan or plans, that have yet to vest. + References No definition available. + Details
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- Definition Amount of cash outflow for repurchase of common stock to satisfy employee tax withholding obligations for stock issued as part of an employee benefit plan. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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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 difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during 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 (c)(1)(iv)(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(1)(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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Balance Type: | na
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- Definition For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer. + References No definition available. + Details
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- Details
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