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Stock-Based Compensation, Stock Option Activity (Details) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Stock-Based Compensation [Abstract]      
Shares, Outstanding, Beginning Balance (in shares) 3,572,116us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber    
Shares, Granted (in shares) 39,975us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod    
Shares, Exercised (in shares) (105,820)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised    
Shares, Forfeited or expired (in shares) (16,618)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod    
Shares, Outstanding, Ending Balance (in shares) 3,489,653us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber   3,572,116us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Shares, Exercisable (in shares) 1,697,219us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber    
Shares, Vested and expected to vest (in shares) 3,269,812us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber    
Weighted- Average Exercise Price, Outstanding, Beginning Balance (in dollars per share) $ 11.40us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice    
Weighted- Average Exercise Price, Granted (in dollars per share) $ 32.91us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice    
Weighted- Average Exercise Price, Exercised (in dollars per share) $ 2.57us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice    
Weighted- Average Exercise Price, Forfeited or expired (in dollars per share) $ 17.59us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice    
Weighted- Average Exercise Price, Outstanding, Ending Balance (in dollars per share) $ 11.88us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice   $ 11.40us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Weighted- Average Exercise Price, Exercisable (in dollars per share) $ 3.80us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice    
Weighted- Average Exercise Price, Vested and expected to vest (in dollars per share) $ 11.50us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice    
Weighted- Average Remaining Contractual Term, Outstanding 7 years 2 months 12 days   7 years 3 months 18 days
Weighted- Average Remaining Contractual Term, Exercisable 5 years 3 months 18 days    
Weighted- Average Remaining Contractual Term, Vested and expected to vest 7 years 1 month 6 days    
Aggregate Intrinsic Value, Outstanding, Ending Balance $ 68,188,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue    
Aggregate Intrinsic Value, Exercisable 46,834,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1    
Aggregate Intrinsic Value, Vested and expected to vest 65,120,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue    
Weighted-average grant-date fair value of options granted (in dollars per share) $ 19.05us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue    
Intrinsic value of options exercised 3,300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue    
Cash received for options exercised 255,000us-gaap_ProceedsFromStockOptionsExercised 68,000us-gaap_ProceedsFromStockOptionsExercised  
Fair value of shares vested 800,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1    
Unrecognized compensation expense related to non-vested stock-options, net of related forfeiture estimates $ 18,500,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized    
Unrecognized compensation expense recognition period 4 years