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Stock-Based Compensation (Details 2) (Stock Options, USD $)
Share data in Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Stock Options  
Options outstanding at the beginning of the period (in shares) 1,495us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Exercised (in shares) (56)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Cancelled (in shares) (273)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
Options outstanding at the end of the period (in shares) 1,166us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Options exercisable at the end of the period (in shares) 1,044us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
Weighted Average Exercise Price Per Share  
Options outstanding at the beginning of the period (in dollars per share) $ 33.39us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Exercised (in dollars per share) $ 10.21us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
Cancelled (in dollars per share) $ 61.79us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice
Options outstanding at end of period, (in dollars per share) $ 27.85us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Options exercisable at the end of period (in dollars per share) $ 27.08us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
Weighted Average Remaining Life  
Outstanding at the end of the period 3 years
Exercisable at the end of the period 2 years 8 months 12 days
Aggregate Intrinsic Value  
Outstanding at the end of the period (in dollars) $ 12,513,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
Exercisable at the end of the period (in dollars) 12,083,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
Total intrinsic value of stock options exercised (in dollars) 1,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
Unrecognized compensation  
Expected unrecognized compensation cost related to unvested stock options (in dollars) $ 1,400,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
Weighted-average period over which the expected unrecognized compensation cost related to unvested stock options will be recognized 1 year 7 months 6 days
First anniversary vesting
  
Stock-based compensation  
Vesting percentage 33.33%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_VestingAxis
= us-gaap_ShareBasedCompensationAwardTrancheOneMember
Vesting period 1 year
Second anniversary vesting
  
Stock-based compensation  
Vesting percentage 33.33%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_VestingAxis
= us-gaap_ShareBasedCompensationAwardTrancheTwoMember
Vesting period 2 years
Third anniversary vesting
  
Stock-based compensation  
Vesting percentage 33.33%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_VestingAxis
= us-gaap_ShareBasedCompensationAwardTrancheThreeMember
Vesting period 3 years
Maximum
  
Stock-based compensation  
Expiration period 7 years