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Equity Plans (Narrative) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense $ 7,288us-gaap_AllocatedShareBasedCompensationExpense $ 5,080us-gaap_AllocatedShareBasedCompensationExpense
Total unrecognized share-based compensation costs, remaining period of recognition (in years) 3 years 73 days  
Common Class A [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
New shares of Company's Class A common stock issued 232,109us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
Restricted Stock Units (RSUs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares surrendered to the Company for tax withholding 171,382us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
 
Total unrecognized share-based compensation costs 79,447us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
 
Restricted Stock Units (RSUs) [Member] | Common Class A [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares vested in period 403,491us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
Adjustments related to tax withholding for share-based compensation $ 12,848us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
Restricted Stock Units (RSUs) [Member] | Employee Stock Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Awards granted in period 437,717us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
 
Performance Vesting Options [Member] | Employee Stock Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Awards granted in period 125,465us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember