XML 65 R51.htm IDEA: XBRL DOCUMENT v3.3.1.900
Income Taxes Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets:        
Advances and contributions $ 16,212 $ 16,612 $ 16,212  
Unamortized investment tax credit 709 676 709  
Pensions and postretirement benefits 4,216 4,094 4,216  
California franchise tax 0 1,322 0  
Net operating loss 5,065 0 5,065  
Other 1,697 3,410 1,697  
Total deferred tax assets 27,899 26,114 27,899  
Deferred tax liabilities:        
Utility plant 150,662 165,293 150,662  
Pension and postretirement benefits 47,059 44,482 47,059  
Investment in stock 2,335 2,193 2,335  
Deferred gain and other-property related 11,695 11,686 11,695  
Debt reacquisition costs 443 397 443  
Other 1,211 838 1,211  
Total deferred tax liabilities 213,405 224,889 213,405  
Net deferred tax liabilities 185,506 198,775 185,506  
Income Tax Credits and Adjustments 880      
Provision for income taxes   23,272 24,971 $ 14,135
Federal        
Deferred tax liabilities:        
Net operating loss carryforward   15,854    
State and Local Jurisdiction [Member]        
Deferred tax liabilities:        
Operating loss carryforward as reported on tax return   1,525    
Income Tax Credits and Adjustments     77,999  
Provision for income taxes     4,482  
Domestic Tax Authority [Member]        
Deferred tax liabilities:        
Other 12,569   12,569  
Income Tax Credits and Adjustments     35,912  
2015 Federal and State Repairs and Maintenance Deduction [Member]        
Deferred tax liabilities:        
Income Tax Credits and Adjustments   18,820    
2015 Federal and State Repairs and Maintenance Deduction [Member] | State and Local Jurisdiction [Member]        
Deferred tax liabilities:        
Provision for income taxes   (1,081)    
2015 Federal and State Repairs and Maintenance Deduction [Member] | Domestic Tax Authority [Member]        
Deferred tax liabilities:        
Other   $ 6,587    
2014 Federal and State Repairs and Maintenance Deduction [Member]        
Deferred tax liabilities:        
Income Tax Credits and Adjustments     11,221  
2014 Federal and State Repairs and Maintenance Deduction [Member] | State and Local Jurisdiction [Member]        
Deferred tax liabilities:        
Provision for income taxes     (645)  
2014 Federal and State Repairs and Maintenance Deduction [Member] | Domestic Tax Authority [Member]        
Deferred tax liabilities:        
Other $ 3,927   $ 3,927