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Consolidated Statements Of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Operating Activities:    
Net income $ 80,600 $ 83,859
Non-cash items included in net income:    
Depreciation and amortization 92,584 86,790
Provision for deferred income taxes (1,272) 36,169
Power and natural gas cost amortizations (deferrals), net 6,701 6,366
Amortization of debt expense 1,635 1,627
Amortization of investment in exchange power 1,225 1,225
Stock-based compensation expense 3,878 2,643
Equity-related AFUDC (2,845) (3,292)
Pension and other postretirement benefit expense 16,025 18,539
Other regulatory assets and liabilities and deferred debits and credits 21,323 (8,831)
Change in decoupling regulatory deferral 2,226 10,365
Other 2,108 420
Contributions to defined benefit pension plan (14,600) (14,800)
Cash paid for settlement of interest rate swap agreements (31,484) 0
Cash received for settlement of interest rate swap agreements 5,594 0
Changes in certain current assets and liabilities:    
Accounts and notes receivable 65,843 45,375
Materials and supplies, fuel stock and natural gas stored 1,174 (7,879)
Collateral posted for derivative instruments 44,080 (5,460)
Income taxes receivable (76) 12,457
Other current assets 3,908 (3,825)
Accounts payable (21,642) (29,435)
Other current liabilities (1,560) (3,787)
Net cash provided by operating activities 275,425 228,526
Investing Activities:    
Utility property capital expenditures (excluding equity-related AFUDC) (183,132) (177,714)
Issuance of notes receivable at subsidiaries (2,780) (2,500)
Equity and property investments made by subsidiaries (7,431) (10,347)
Other 438 972
Net cash used in investing activities (192,905) (189,589)
Financing Activities:    
Net increase (decrease) in short-term borrowings (105,398) 16,000
Proceeds from issuance of long-term debt 374,621 0
Maturity of long-term debt and capital leases (276,170) (1,643)
Issuance of common stock 1,227 1,247
Cash dividends paid (49,101) (46,193)
Other (8,538) (3,445)
Net cash used in financing activities (63,359) (34,034)
Net increase in cash and cash equivalents 19,161 4,903
Cash and cash equivalents at beginning of period 16,172 8,507
Cash and cash equivalents at end of period $ 35,333 $ 13,410