CONDENSED CONSOLIDATED STATEMENTS OF FINANCIAL POSITION (UNAUDITED) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current assets
Cash and cash equivalents	$ 8,221	$ 13,859
Accounts receivable	120,533	104,262
Inventory	27,577	25,777
Regulatory assets	16,937	14,736
Income tax receivable	141,323	0
Prepaid and other current assets	10,920	10,608
Total current assets	325,511	169,242
Property, plant and equipment (net of accumulated depreciation and amortization of $1,512,637 and $1,487,713, respectively)	6,246,320	6,109,639
Other assets
Goodwill	950,163	950,163
Intangible assets (net of accumulated amortization of $29,073 and $28,242, respectively)	44,950	45,602
Regulatory assets	249,264	233,376
Deferred financing fees (net of accumulated amortization of $1,469 and $1,277, respectively)	3,343	2,498
Other	43,691	44,802
Total other assets	1,291,411	1,276,441
TOTAL ASSETS	7,863,242	7,555,322
Current liabilities
Accounts payable	117,461	124,331
Accrued payroll	13,985	24,123
Accrued interest	39,576	52,577
Accrued taxes	33,475	44,256
Regulatory liabilities	36,102	44,964
Refundable deposits from generators for transmission network upgrades	16,744	2,534
Debt maturing within one year	607,058	395,105
Other	28,374	31,034
Total current liabilities	892,775	718,924
Accrued pension and postretirement liabilities	65,907	61,609
Deferred income taxes	898,858	735,426
Regulatory liabilities	273,564	254,788
Refundable deposits from generators for transmission network upgrades	7,522	18,077
Other	27,848	23,075
Long-term debt	$ 3,947,954	$ 4,034,352
Commitments and contingent liabilities (Notes 3 and 10)
STOCKHOLDERS’ EQUITY
Common stock, without par value, 300,000,000 shares authorized, 152,766,017 and 152,699,077 shares issued and outstanding at March 31, 2016 and December 31, 2015, respectively	$ 835,513	$ 829,211
Retained earnings	911,198	875,595
Accumulated other comprehensive income	2,103	4,265
Total stockholders’ equity	1,748,814	1,709,071
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 7,863,242	$ 7,555,322