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Variable Interest Entities VIEs (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2012
Assets        
Cash and cash equivalents $ 872,910 $ 830,014 $ 766,700 $ 740,481
Other current assets 35,154 35,151    
Property, plant and equipment, net 3,779,133 3,878,144    
Other assets and deferred charges 178,599 164,482    
Liabilities        
Current liabilities 1,025,179 1,191,756    
Variable Interest Entities (VIE's)
        
Assets        
Cash and cash equivalents 2,325 2,076    
Other current assets 1,126 1,184    
Licenses 310,475 310,475    
Property, plant and equipment, net 16,940 18,600    
Other assets and deferred charges 511 511    
Total assets 331,377 332,846    
Liabilities        
Current liabilities 135 46    
Deferred liabilities and credits 2,122 3,139    
Total liabilities $ 2,257 $ 3,185