CONDENSED CONSOLIDATED STATEMENTS OF FINANCIAL POSITION (UNAUDITED) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Current assets
Cash and cash equivalents	$ 6,054	$ 13,859
Accounts receivable	147,882	104,262
Inventory	27,852	25,777
Regulatory assets	19,112	14,736
Income tax receivable	144,573	0
Prepaid and other current assets	15,622	10,608
Total current assets	361,095	169,242
Property, plant and equipment (net of accumulated depreciation and amortization of $1,540,568 and $1,487,713, respectively)	6,409,440	6,109,639
Other assets
Goodwill	950,163	950,163
Intangible assets (net of accumulated amortization of $29,905 and $28,242, respectively)	44,283	45,602
Regulatory assets	245,870	233,376
Deferred financing fees (net of accumulated amortization of $1,661 and $1,277, respectively)	5,313	2,498
Other	50,802	44,802
Total other assets	1,296,431	1,276,441
TOTAL ASSETS	8,066,966	7,555,322
Current liabilities
Accounts payable	146,934	124,331
Accrued compensation	18,977	24,123
Accrued interest	54,003	52,577
Accrued taxes	48,358	44,256
Regulatory liabilities	27,621	44,964
Refundable deposits from generators for transmission network upgrades	16,418	2,534
Debt maturing within one year	451,232	395,105
Other	21,475	31,034
Total current liabilities	785,018	718,924
Accrued pension and postretirement liabilities	64,792	61,609
Deferred income taxes	947,036	735,426
Regulatory liabilities	284,321	254,788
Refundable deposits from generators for transmission network upgrades	16,661	18,077
Other	29,249	23,075
Long-term debt	4,146,892	4,034,352
Commitments and contingent liabilities (Notes 3 and 11)
STOCKHOLDERS’ EQUITY
Common stock, without par value, 300,000,000 shares authorized, 153,365,025 and 152,699,077 shares issued and outstanding at June 30, 2016 and December 31, 2015, respectively	842,893	829,211
Retained earnings	953,180	875,595
Accumulated other comprehensive (loss) income	(3,076)	4,265
Total stockholders’ equity	1,792,997	1,709,071
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 8,066,966	$ 7,555,322