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Net Income Per Share Calculation of Net Income 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 [Abstract]                      
Net income $ 84,053us-gaap_NetIncomeLoss $ 85,184us-gaap_NetIncomeLoss $ 75,140us-gaap_NetIncomeLoss $ 61,551us-gaap_NetIncomeLoss $ 66,885us-gaap_NetIncomeLoss $ 66,358us-gaap_NetIncomeLoss $ 63,089us-gaap_NetIncomeLoss $ 55,863us-gaap_NetIncomeLoss $ 305,928us-gaap_NetIncomeLoss $ 252,195us-gaap_NetIncomeLoss $ 209,942us-gaap_NetIncomeLoss
Income allocated to participating securities-basic                 0us-gaap_UndistributedEarnings 3us-gaap_UndistributedEarnings 1,081us-gaap_UndistributedEarnings
Net income available to common stockholders-basic                 305,928us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 252,192us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 208,861us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Basic weighted average shares                 134,358us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 136,153us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 138,201us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Basic net income per share $ 0.63us-gaap_EarningsPerShareBasic $ 0.64us-gaap_EarningsPerShareBasic $ 0.56us-gaap_EarningsPerShareBasic $ 0.45us-gaap_EarningsPerShareBasic $ 0.49us-gaap_EarningsPerShareBasic $ 0.49us-gaap_EarningsPerShareBasic $ 0.46us-gaap_EarningsPerShareBasic $ 0.41us-gaap_EarningsPerShareBasic $ 2.28us-gaap_EarningsPerShareBasic $ 1.85us-gaap_EarningsPerShareBasic $ 1.51us-gaap_EarningsPerShareBasic
Income allocated to participating securities-diluted                 0us-gaap_UndistributedEarningsDiluted 3us-gaap_UndistributedEarningsDiluted 1,075us-gaap_UndistributedEarningsDiluted
Net income available to common stockholders—diluted $ 84,053us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ 85,184us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ 75,140us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ 61,551us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ 66,885us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ 66,358us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ 63,088us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ 55,861us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ 305,928us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ 252,192us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ 208,867us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Basic weighted average shares                 134,358us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 136,153us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 138,201us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive effect of potential common shares                 1,183us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment 1,436us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment 1,208us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Diluted weighted average shares                 135,541us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 137,589us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 139,409us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Diluted net income per share $ 0.62us-gaap_EarningsPerShareDiluted $ 0.63us-gaap_EarningsPerShareDiluted $ 0.55us-gaap_EarningsPerShareDiluted $ 0.45us-gaap_EarningsPerShareDiluted $ 0.49us-gaap_EarningsPerShareDiluted $ 0.48us-gaap_EarningsPerShareDiluted $ 0.46us-gaap_EarningsPerShareDiluted $ 0.40us-gaap_EarningsPerShareDiluted $ 2.26us-gaap_EarningsPerShareDiluted $ 1.83us-gaap_EarningsPerShareDiluted $ 1.50us-gaap_EarningsPerShareDiluted