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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2014
Asset Retirement Obligations [Abstract]  
Changes In Asset Retirement Obligation Liability

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2014

 

2013

 

 

(In thousands)

Asset retirement obligation as of beginning of period

 

$ 
63,831 

 

$ 
44,696 

Additional obligations 

 

 
8,373 

 

 
6,399 

Estimated obligations assumed in acquisition

 

 
6,097 

 

 
18,494 

Purchase price adjustment

 

 
(6,653)

 

 

—

Accretion expense 

 

 
2,559 

 

 
2,777 

Change in estimates

 

 
(13,534)

 

 
(6,477)

Payments 

 

 
(3,702)

 

 
(2,495)

Foreign currency translation adjustments 

 

 
(1,835)

 

 
437 

Total asset retirement obligation at end of period 

 

 
55,136 

 

 
63,831 

Less: current portion 

 

 
3,097 

 

 
3,166 

Asset retirement obligation, excluding current portion 

 

$ 
52,039 

 

$ 
60,665