Environmental Matters (tables)

3 Months Ended

Mar. 31, 2015

Environmental Remediation Obligations [Abstract]

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

	Current Liabilities						Non-Current Liabilities
	March 31,				December 31,		March 31,				December 31,
In thousands	2015		2014		2014		2015		2014		2014
Portland Harbor site:
Gasco/Siltronic Sediments	$	1,572	$	776	$	1,767	$	38,379	$	38,584	$	38,019
Other Portland Harbor	1,308		1,408		1,934		5,186		3,283		4,338
Gasco site	8,205		8,766		9,535		36,833		39,482		37,117
Siltronic Uplands site	750		872		957		405		394		348
Central Service Center site	170		70		171		—		224		—
Front Street site	755		1,176		1,020		115		115		122
Oregon Steel Mills	—		—		—		179		179		179
Total	$	12,760	$	13,068	$	15,384	$	81,097	$	82,261	$	80,123

Environmental Regulatory Table [Table Text Block]

	March 31,				December 31,
In thousands	2015		2014		2014
Cumulative cash paid	$	117,005	$	106,105	$	113,740
Total regulatory asset deferral(1)	50,175		63,517		58,859