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Earnings Per Share (Details) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                      
Earnings for basic computations                 $ 229,082,000 $ 209,994,000 $ 238,761,000
Weighted-average common shares outstanding for basic computations                 141,314,544 134,402,729 130,145,689
Earnings for diluted computations                 229,082,000 209,994,000 238,761,000
Dilutive stock options and restricted stock                 7,366,530 10,451,995 10,666,323
Average number of common shares outstanding for diluted computations                 148,681,074 144,854,724 140,812,012
Earnings per common share, Basic $ 0.32 $ 0.32 $ 0.48 $ 0.51 $ 0.40 $ 0.41 $ 0.29 $ 0.46 $ 1.62 $ 1.56 $ 1.83
Earnings per common share, Diluted $ 0 $ 0.31 $ 0.45 $ 0.48 $ 0.37 $ 0.38 $ 0.27 $ 0.43 $ 1.54 $ 1.45 $ 1.70
Unvested shares, cash dividends paid                 56,138,000 49,765,000 0
Restricted Stock
                     
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                      
Unvested shares participating in the payment of the Company's dividends declared                 1,300,000 1,200,000 787,000
Unvested shares, cash dividends paid                 3,100,000 9,100,000 71,000
Undistributed earnings allocated to participating securities                     $ 1,100,000
Stock Options
                     
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                      
Antidilutive options excluded from the computation of EPS                 1,072,000 328,000 2,529,000
Common stock, Class A
                     
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                      
Weighted-average common shares outstanding for basic computations                 139,275,596 131,068,847 125,894,644
Non-voting common stock, Class B
                     
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                      
Weighted-average common shares outstanding for basic computations                 1,019,051 2,080,050 2,791,917
Restricted common stock, Class C
                     
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                      
Weighted-average common shares outstanding for basic computations                 1,019,897 1,253,832 1,459,128