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Earnings Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 1,100,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 2,700,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Net Income (Loss) Attributable to Parent [Abstract]    
Net income attributable to common stockholders $ 61,375us-gaap_NetIncomeLoss $ 41,102us-gaap_NetIncomeLoss
After tax interest on convertible debt 12us-gaap_InterestOnConvertibleDebtNetOfTax 13us-gaap_InterestOnConvertibleDebtNetOfTax
Net income — diluted $ 61,387us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ 41,115us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Weighted average shares (denominator):    
Weighted average shares — basic (203,510,000)us-gaap_WeightedAverageNumberOfSharesOutstandingBasic (212,838,000)us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Stock options 4,121,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 4,272,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Convertible debt 121,000us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities 121,000us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities
Weighted average shares — diluted 207,752,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 217,231,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net income attributable to common stockholders, basic $ 0.30us-gaap_EarningsPerShareBasic $ 0.19us-gaap_EarningsPerShareBasic
Net income attributable to common stockholders, diluted $ 0.30us-gaap_EarningsPerShareDiluted $ 0.19us-gaap_EarningsPerShareDiluted