Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2015

Asset Retirement Obligation [Abstract]

Schedule of Asset Retirement Obligations [Table Text Block]

Changes in the carrying amounts of the Company’s AROs for the years ended December 31, 2015 and 2014 are shown below:

(In thousands)
Balance at December 31, 2013	$	2,167
Liabilities assumed in ATMI acquisition	7,365
Liabilities settled	(128		)
Liabilities incurred	248
Accretion expense	195
Revision of estimate	103
Balance at December 31, 2014	9,950
Adjustment to liabilities assumed in ATMI acquisition	589
Liabilities settled	(698		)
Liabilities incurred	1,094
Accretion expense	196
Revision of estimate	203
Balance at December 31, 2015	$	11,334