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Subsequent Events (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 2 Months Ended 6 Months Ended 12 Months Ended 108 Months Ended 128 Months Ended
Jun. 30, 2004
Dec. 31, 2004
Dec. 31, 2014
Dec. 31, 2012
Dec. 31, 2013
Dec. 31, 2014
Subsequent Event [Line Items]            
Repurchase of common stock 39,865,266us-gaap_StockRepurchasedAndRetiredDuringPeriodShares 39,865,266us-gaap_StockRepurchasedAndRetiredDuringPeriodShares     39,865,266us-gaap_StockRepurchasedAndRetiredDuringPeriodShares 40,032,366us-gaap_StockRepurchasedAndRetiredDuringPeriodShares
Aggregate cost of common stock repurchase $ 784,040us-gaap_StockRepurchasedAndRetiredDuringPeriodValue $ 784,040us-gaap_StockRepurchasedAndRetiredDuringPeriodValue $ 7,317us-gaap_StockRepurchasedAndRetiredDuringPeriodValue $ 18,597us-gaap_StockRepurchasedAndRetiredDuringPeriodValue $ 784,040us-gaap_StockRepurchasedAndRetiredDuringPeriodValue $ 791,357us-gaap_StockRepurchasedAndRetiredDuringPeriodValue
Subsequent Event [Member]            
Subsequent Event [Line Items]            
Dividends, declared date     Feb. 09, 2015      
Dividends per share amount     $ 0.13us-gaap_CommonStockDividendsPerShareDeclared
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Dividends, date to be paid     Mar. 16, 2015      
Dividends, date of record     Mar. 02, 2015      
Repurchase of common stock     428,669us-gaap_StockRepurchasedAndRetiredDuringPeriodShares
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Aggregate cost of common stock repurchase     $ 18,366us-gaap_StockRepurchasedAndRetiredDuringPeriodValue
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