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Repurchases of Common Stock (Summary of Stock Repurchases During the Year) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Class of Stock Disclosures [Abstract]      
Repurchase of common stock (in shares) 7,925,227us-gaap_TreasuryStockSharesAcquired 3,306,433us-gaap_TreasuryStockSharesAcquired 2,799,115us-gaap_TreasuryStockSharesAcquired
Repurchase of common stock $ (545,140)us-gaap_TreasuryStockValueAcquiredCostMethod $ (195,004)us-gaap_TreasuryStockValueAcquiredCostMethod $ (139,724)us-gaap_TreasuryStockValueAcquiredCostMethod