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CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY (USD $)
In Thousands, except Share data, unless otherwise specified
Class A Common Stock
Paid-in Capital
Retained Earnings
Total
Balance at Dec. 31, 2014 $ 1,010us-gaap_StockholdersEquity
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
$ 2,215,479us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ 555,573us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ 2,772,062us-gaap_StockholdersEquity
Balance (in shares) at Dec. 31, 2014 102,392,208us-gaap_SharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
     
Increase (Decrease) in Shareholders' Equity        
Issuance of common stock upon vesting of restricted stock units   47us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
  47us-gaap_StockIssuedDuringPeriodValueNewIssues
Issuance of common stock upon vesting of restricted stock units (in shares) 297,255us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
     
Stock-based compensation expense   3,146us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
  3,146us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Cash dividends (declared $0.04 per share)     (4,101)us-gaap_DividendsCommonStockCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
(4,101)us-gaap_DividendsCommonStockCash
Tax withholdings related to vesting of restricted stock units   (5,302)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
  (5,302)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation
Tax withholdings related to vesting of restricted stock units (in shares) (130,934)us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
     
Net income     19,332us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
19,332us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Balance at Mar. 31, 2015 $ 1,010us-gaap_StockholdersEquity
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
$ 2,213,370us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ 570,804us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ 2,785,184us-gaap_StockholdersEquity
Balance (in shares) at Mar. 31, 2015 102,558,529us-gaap_SharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember