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Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Tax benefit related to delivery of Class A Common Stock in connection with share-based incentive compensation $ 4,783us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation $ 40us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation $ 972us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation
Class A Common Stock [Member]      
Common stock, issued 129,766,091us-gaap_CommonStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 129,056,081us-gaap_CommonStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 128,216,423us-gaap_CommonStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Class B Common Stock [Member]      
Common stock, issued   1us-gaap_CommonStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 1us-gaap_CommonStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember