Three Months Ended March 31, 2017 | Year Ended Dec. 31 | ||||||||||||||||||||||
| 2016 | 2015 | 2014 | 2013 | 2012 | |||||||||||||||||||
| Earnings, as defined: | |||||||||||||||||||||||
| Pretax income | $ | 176,771 | $ | 737,409 | $ | 745,242 | $ | 698,779 | $ | 704,123 | $ | 690,620 | |||||||||||
| Add: Fixed charges | 58,976 | 236,080 | 235,530 | 232,832 | 232,539 | 254,443 | |||||||||||||||||
| Total earnings, as defined | $ | 235,747 | $ | 973,489 | $ | 980,772 | $ | 931,611 | $ | 936,662 | $ | 945,063 | |||||||||||
| Fixed charges, as defined: | |||||||||||||||||||||||
| Interest charges | $ | 45,882 | $ | 181,631 | $ | 177,430 | $ | 171,881 | $ | 173,602 | $ | 188,094 | |||||||||||
| Interest charges on life insurance policy borrowings | 59 | 203 | 233 | 214 | 245 | 310 | |||||||||||||||||
| Interest component of leases | 13,035 | 54,246 | 57,867 | 60,737 | 58,692 | 66,039 | |||||||||||||||||
| Total fixed charges, as defined | $ | 58,976 | $ | 236,080 | $ | 235,530 | $ | 232,832 | $ | 232,539 | $ | 254,443 | |||||||||||
| Ratio of earnings to fixed charges | 4.0 | 4.1 | 4.2 | 4.0 | 4.0 | 3.7 | |||||||||||||||||
