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Income Taxes (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
State
Dec. 31, 2013
State
Certain subsidiaries
Deferred tax assets:        
Stock-based compensation expense $ 51,045,000 $ 48,098,000    
Accrued expenses 57,387,000 64,047,000    
Intangibles 43,204,000      
Deferred tax assets resulting from unrecognized tax benefits 10,817,000 10,839,000    
Net operating losses 4,690,000 6,935,000 4,400,000  
Accumulated other comprehensive loss 1,863,000 2,709,000    
Gross deferred tax assets 169,006,000 132,628,000    
Less valuation allowance (3,664,000) (3,221,000)    
Net deferred tax assets 165,342,000 129,407,000    
Deferred tax liabilities:        
Property, plant and equipment (102,379,000) (174,285,000)    
Investments in unconsolidated affiliates (5,782,000)      
Intangibles   (131,686,000)    
Net deferred tax liabilities (108,161,000) (305,971,000)    
Net: 57,181,000 (176,564,000)    
Reflected on consolidated balance sheets:        
Current deferred tax assets, net 71,093,000 39,793,000    
Non current deferred tax liabilities, net (13,912,000) (216,357,000)    
Net: 57,181,000 (176,564,000)    
Operating loss carryforwards        
Net operating loss carryforwards     170,000,000  
Tax benefit associated with net operating loss carryforwards 4,690,000 6,935,000 4,400,000  
Valuation allowance recorded to reflect the net operating losses which are not presently expected to be realized     3,400,000  
Gross state net operating loss carryforwards for which no benefit has been recorded as they are attributable to uncertain tax positions       1,400,000,000
Unrecognized tax benefits attributable to the net operating losses       86,300,000
Increase to equity in the event of any benefit from realization of net operating losses       $ 9,700,000