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Environmental Matters (Tables)

12 Months Ended

Dec. 31, 2016

Environmental Remediation Obligations [Abstract]

Schedule of Environmental Loss Contingencies by Site [Table Text Block]



		Current Liabilities								Non-Current Liabilities
In thousands		2016				2015				2016				2015
Portland Harbor site:
Gasco/Siltronic Sediments		$	869			$	2,229			$	43,972			$	42,641
Other Portland Harbor		1,970				1,972				4,148				5,073
Gasco/Siltronic Upland site		10,657				11,550				49,183				52,454
Central Service Center site		73				25				—				—
Front Street site		906				1,155				7,786				7,748
Oregon Steel Mills		—				—				179				179
Total		$	14,475			$	16,931			$	105,268			$	108,095

Environmental Regulatory Table [Table Text Block]



In thousands		2016				2015
Deferred costs and interest ⁽¹⁾		$	53,039			$	79,505
Accrued site liabilities ⁽²⁾		119,443				125,026
Insurance proceeds and interest		(98,523		)		(118,677		)
Total regulatory asset deferral⁽¹⁾		$	73,959			$	85,854
Current regulatory assets⁽³⁾		9,989				9,270
Long-term regulatory assets⁽³⁾		63,970				76,584