Supplemental Statements of Cash Flows Disclosures (Tables)

12 Months Ended

Dec. 31, 2016

Supplemental Cash Flow Information [Abstract]

Schedule of Cash Flow, Supplemental Disclosures

	Years Ended December 31,
	2016		2015			2014
	(In thousands)
Cash paid for:
Interest on long-term debt and borrowing under the revolving credit facility	$	69,990	$	62,297		$	54,792
Income taxes, net of refund	2,328		1,000			6,876
Non-cash investing and financing activities:
Sale of Interest in Four Corners Generating Station (a)	27,720		—			—
Changes in accrued plant additions	4,789		(6,660		)	7,314
Grants of restricted shares of common stock	1,236		1,567			3,025

(a) The Company sold its interest in Four Corners for approximately $32.0 million based on the book value as defined in the Purchase and Sale Agreement. The sales price was adjusted downward by $7.0 million and $19.5 million to reflect APS's affiliate assumption of the Company's obligation to pay for future plant decommissioning and mine reclamation expense, respectively. The sales price was also adjusted downward by approximately $1.3 million for closing adjustments and other assets and liabilities assumed by APS's affiliate. At the closing of the sale, the Company received approximately $4.2 million in cash, subject to post-closing adjustments.