|
Reconciliation of Income Tax Expense from Continuing Operations (Details) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2013
|
Dec. 31, 2012
|
Dec. 31, 2011
|
|
| Income Tax Rate Reconciliation [Line Items] | |||
| Income tax at statutory rate | $ 211,914 | $ 220,940 | $ 176,288 |
| State taxes, net of federal taxes | 21,852 | 32,877 | 24,027 |
| Change in valuation allowance | (455) | 143 | (160) |
| Flow through differences | 3,217 | 3,032 | 2,895 |
| Amortization of deferred investment tax credits | (1,501) | (1,518) | (1,542) |
| Subsidiary preferred dividends | 584 | 634 | 668 |
| Other, net | 595 | 900 | (3,425) |
| Actual income tax expense | $ 236,206 | $ 257,008 | $ 198,751 |