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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2017
Asset Retirement Obligations  
Changes In Asset Retirement Obligation Liability

 

 

 

 

 

 

 

 

 

December 31, 2017

    

December 31, 2016

 

 

 

 

 

 

 

 

 

(In thousands)

Asset retirement obligations as of the beginning of the period

    

$

54,907

    

$

54,727

Additional obligations

 

 

11,727

 

 

8,720

Estimated obligations assumed in acquisitions

 

 

9,343

 

 

 —

Accretion expense

 

 

1,856

 

 

1,803

Change in estimates

 

 

(108)

 

 

(1,638)

Payments

 

 

(9,788)

 

 

(4,351)

Foreign currency translation adjustments

 

 

1,820

 

 

(4,354)

Asset retirement obligations at the end of the period

 

 

69,757

 

 

54,907

Less: current portion of asset retirement obligations

 

 

9,837

 

 

9,821

Asset retirement obligations, excluding current portion, at the end of the period

 

$

59,920

 

$

45,086