XML 87 R70.htm IDEA: XBRL DOCUMENT v3.3.1.900
INCOME TAXES - Reconciliation of Income Tax Expense with Federal Income Taxes at the Statutory Rate (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Operating Loss Carryforwards [Line Items]      
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 35.00% 35.00% 35.00%
Reconciliation of income tax expense with federal income taxes at the statutory rate      
Federal income tax at the 35% statutory rate $ 437,746 $ 467,035 $ 450,660
State income taxes, net of federal income tax benefit 29,507 31,263 27,430
Other - net 11,636 23,792 1,760
Income taxes $ 465,531 $ 522,090 $ 479,850
Effective tax rate 37.20% 39.10% 37.30%
Clean Energy Credit [Member]      
Reconciliation of income tax expense with federal income taxes at the statutory rate      
Clean energy credit $ (13,358) $ 0 $ 0