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Commitments and Contingencies Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2011
Commitments and Contingencies [Abstract]  
Long-term Purchase Commitment [Table Text Block]
Years Ending December 31,
 
(in thousands)
 
 
 
2012
 
$
131,021

2013
 
99,633

2014
 
108,629

2015
 
97,401

2016
 
100,635

Thereafter
 
561,642

Total
 
$
1,098,961