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Condensed Consolidated Statement of Changes in Stockholders' Equity (Unaudited) (USD $)
In Thousands, except Share data, unless otherwise specified
Total
Common Stock [Member]
Treasury Stock [Member]
Additional Paid-in-Capital [Member]
Retained Earnings [Member]
Balance at Dec. 31, 2014 $ 1,872,301us-gaap_StockholdersEquity $ 1,001us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 $ (10,671)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember		 $ 1,007,202us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 $ 874,769us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Balance, shares at Dec. 31, 2014   101,342,000us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 286,000us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember		    
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock 463,218us-gaap_StockIssuedDuringPeriodValueNewIssues 368us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		   462,850us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		  
Issuance of common stock, shares   36,800,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		      
Stock-based compensation 8,287us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation     8,287us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		  
Stock-based compensation, shares   1,191,000us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		      
Vesting of restricted shares   3us-gaap_RestrictedStockValueSharesIssuedNetOfTaxWithholdings
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		   (3)us-gaap_RestrictedStockValueSharesIssuedNetOfTaxWithholdings
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		  
Treasury stock – tax withholdings (1,520)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation   (1,520)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember		    
Treasury stock - tax withholdings, shares   (112,000)us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 112,000us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember		    
Net loss (18,041)us-gaap_NetIncomeLoss       (18,041)us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Balance at Mar. 31, 2015 $ 2,324,245us-gaap_StockholdersEquity $ 1,372us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 $ (12,191)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember		 $ 1,478,336us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 $ 856,728us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Balance, shares at Mar. 31, 2015   139,221,000us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 398,000us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember