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Performance Units - Additional Information (Details) (Performance Units, USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 | Dec. 31, 2013
Employee Compensation Plans |  |
Performance units, vesting period (in years) | 3 years |
Performance units, payout performance below minimum target threshold | $ 0 |
Performance units liability | $ 2.5 | $ 1.8
Minimum |  |
Employee Compensation Plans |  |
Performance units, payout percentages of target values | 50.00% |
Maximum |  |
Employee Compensation Plans |  |
Performance units, payout percentages of target values | 200.00% |

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- Details
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- Definition Incentive plan payout percentages of target values based on performance above a minimum threshold + References No definition available. + Details
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- Definition Incentive plan payout if actual performance is below established minimum target thresholds + References No definition available. + Details
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- Definition Amount of liabilities accrued for share-based compensation as of the reporting date. + 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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