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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2011
Asset Retirement Obligations [Abstract]  
Changes In Asset Retirement Obligation Liability

 

 

2011

 

 

2010

 

 

 

(In thousands)

 

Asset retirement obligation as of beginning of period

 

$

26,657

 

 

$

24,003

 

Additional obligations

 

 

8,680

 

 

 

4,824

 

Accretion expense

 

 

2,246

 

 

 

2,598

 

Payments

 

 

(2,161

)

 

 

(3,262

)

Change in estimates

 

 

(647

)

 

 

(1,236

)

Foreign currency translation adjustments

 

 

(258

)

 

 

(270

)

Asset retirement obligation as of end of period

 

$

34,517

 

 

$

26,657