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Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Taxes [Line Items]      
Potential equity impact of deferred taxes $ 14,900    
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities 0   $ 0
Unrecognized Tax Benefits, Decreases Resulting from Settlements with Taxing Authorities, Portion Which Affected Effective Tax Rate   $ 19,700  
Deferred Tax Assets and Liabilities [Abstract]      
Current deferred tax liability 0 3,087  
Non-current deferred tax liability 162,189 142,263  
Current deferred tax asset 0 (117)  
Net deferred tax liability 162,189 145,233  
Deferred tax assets      
Federal net operating loss carryforwards 308,738 312,113  
State net operating loss carryforwards 47,711 41,395  
Share-based compensation 32,524 35,122  
Other 43,936 42,554  
Gross deferred tax assets 432,909 431,184  
Valuation allowance (247,761) (261,962)  
Deferred tax assets, net of valuation allowance 185,148 169,222  
Deferred tax liabilities      
Difference between book and tax basis of intangible assets 216,655 202,089  
Difference between book and tax basis of property 105,732 86,280  
State tax liability, net of federal benefit 13,428 11,980  
Other 11,522 14,106  
Gross deferred tax liabilities 347,337 314,455  
State and Local Jurisdiction      
Deferred tax assets      
Federal net operating loss carryforwards 653,500    
All years [Member]      
Income Taxes [Line Items]      
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities   $ 27,700  
Alternative Minimum Tax Credit Carryforward [Member] | Internal Revenue Service (IRS)      
Income Taxes [Line Items]      
Tax credit carryforwards $ 1,100