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Stockholders' Equity Repurchase Program (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Employee Stock Purchase Plan [Line Items]    
Stock Repurchase Program, Remaining Authorized Repurchase Amount $ 101,533us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1  
Common Class A [Member]    
Employee Stock Purchase Plan [Line Items]    
Stock Repurchase Program, Authorized Amount 300,000us-gaap_StockRepurchaseProgramAuthorizedAmount1
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		  
Stock Repurchased During Period, Shares 22,806,304us-gaap_StockRepurchasedDuringPeriodShares
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 4,432,800us-gaap_StockRepurchasedDuringPeriodShares
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Stock Repurchased During Period, Value $ 151,880us-gaap_StockRepurchasedDuringPeriodValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 $ 46,600us-gaap_StockRepurchasedDuringPeriodValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember