Asset Retirement Obligations (Tables)

9 Months Ended

Sep. 30, 2017

Asset Retirement Obligations

Changes In Asset Retirement Obligation Liability

	(In thousands)
Asset retirement obligations as of January 1, 2017	$	54,907
Additional obligations		9,379
Estimated obligations assumed in acquisitions		7,409
Accretion expense		1,396
Change in estimates		(108)
Payments		(5,931)
Foreign currency translation adjustments		1,908
Asset retirement obligations as of September 30, 2017		68,960
Less: current portion of asset retirement obligations		10,535
Asset retirement obligations, excluding current portion, as of September 30, 2017	$	58,425