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Stock-Based Compensation (Details 4) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | ||
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Schedule of exercise prices of stock options outstanding | |||
| Total intrinsic value of options exercised | $ 20,867us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue | $ 13,745us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue | $ 1,611us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue |
| Cash received from exercises of stock options | 5,190us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions | 6,400us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions | 2,069us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions |
| Cash received from issuance of restricted stock | $ 1env_EmployeeServiceShareBasedCompensationCashReceivedFromIssuanceOfRestrictedStock | $ 1env_EmployeeServiceShareBasedCompensationCashReceivedFromIssuanceOfRestrictedStock | $ 2,759env_EmployeeServiceShareBasedCompensationCashReceivedFromIssuanceOfRestrictedStock |
| X | ||||||||||
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- Definition
Employee service share based compensation cash received from issuance of restricted stock. No definition available.
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| X | ||||||||||
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- Definition
Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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