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Stockholders' Equity Earnings per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Jun. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]                      
Basic weighted average number of shares outstanding (in shares)                 101,154,030 104,684,812 107,108,703
Diluted weighted average number of shares outstanding, including dilutive stock options (in shares)                 101,590,351 104,837,470 107,149,240
NET INCOME $ 40,561 $ 37,910 $ 38,657 $ 40,236 $ 42,906 $ 35,978 $ 35,283 $ 37,338 $ 157,364 $ 151,505 $ 138,183
Basic earnings per share (in dollars per share) $ 0.41 $ 0.38 $ 0.38 $ 0.39 $ 0.42 $ 0.34 $ 0.33 $ 0.36 $ 1.56 $ 1.45 $ 1.29
Diluted earnings per share (in dollars per share) $ 0.41 $ 0.37 $ 0.38 $ 0.39 $ 0.41 $ 0.34 $ 0.33 $ 0.36 $ 1.55 $ 1.45 $ 1.29
Warrant
                      
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]                      
Weighted average call options and warrants                 352,171 100,211 0
Equity Option
                      
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]                      
Weighted average call options and warrants                 84,150 52,447 40,537