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

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