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Earnings Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Earnings Per Share [Line Items]                      
Income available to common stockholders, Basic                 $ 177,949us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 112,143us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 116,911us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Effect of dilutive securities: Options                 0us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits 0us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits 0us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits
Income available to common stockholders after assumed conversions, Diluted                 $ 177,949us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ 112,143us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ 116,911us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Weighted Shares, Basic                 55,008us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 54,947us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 54,899us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive securities: Options                 12us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 17us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 23us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Weighted Shares, Diluted                 55,020us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 54,964us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 54,922us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Per-Share Amount, Basic $ (0.38)us-gaap_EarningsPerShareBasic [1] $ 0.57us-gaap_EarningsPerShareBasic [1] $ 1.73us-gaap_EarningsPerShareBasic [1] $ 1.32us-gaap_EarningsPerShareBasic [1] $ 0.28us-gaap_EarningsPerShareBasic $ 0.72us-gaap_EarningsPerShareBasic $ (0.17)us-gaap_EarningsPerShareBasic $ 1.21us-gaap_EarningsPerShareBasic $ 3.23us-gaap_EarningsPerShareBasic $ 2.04us-gaap_EarningsPerShareBasic $ 2.13us-gaap_EarningsPerShareBasic
Per-Share Amount, Diluted $ (0.38)us-gaap_EarningsPerShareDiluted [1],[2] $ 0.57us-gaap_EarningsPerShareDiluted [1] $ 1.73us-gaap_EarningsPerShareDiluted [1] $ 1.32us-gaap_EarningsPerShareDiluted [1] $ 0.28us-gaap_EarningsPerShareDiluted $ 0.72us-gaap_EarningsPerShareDiluted $ (0.17)us-gaap_EarningsPerShareDiluted [2] $ 1.21us-gaap_EarningsPerShareDiluted $ 3.23us-gaap_EarningsPerShareDiluted $ 2.04us-gaap_EarningsPerShareDiluted $ 2.13us-gaap_EarningsPerShareDiluted
Potentially dilutive securities (in shares)                 273us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 421us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 415us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Common Stock [Member]                      
Earnings Per Share [Line Items]                      
Potentially dilutive securities (in shares)                 21us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_CommonStockMember		 63us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_CommonStockMember		 80us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_CommonStockMember
[1] The basic and diluted earnings per share do not sum due to rounding.
[2] The dilutive impact of incremental shares is excluded from net loss position in accordance with GAAP.