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Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2016
Income Taxes [Line Items]    
Unrecognized Tax Benefits, Decreases Resulting from Settlements with Taxing Authorities, Portion Which Affected Effective Tax Rate $ 19,500  
Deferred Tax Assets and Liabilities [Abstract]    
Non-current deferred tax liability 162,189 $ 83,980
Net deferred tax liability 162,189 83,980
Deferred tax assets    
Federal net operating loss carryforwards 308,738 201,978
State net operating loss carryforwards 47,711 38,715
Share-based compensation 32,524 26,344
Other 43,936 61,289
Gross deferred tax assets 432,909 328,326
Valuation allowance (247,761) (28,402)
Deferred tax assets, net of valuation allowance 185,148 299,924
Deferred tax liabilities    
Difference between book and tax basis of property and intangible assets 322,387 337,654
State tax liability 13,428 31,443
Other 11,522 14,807
Gross deferred tax liabilities 347,337 383,904
State and Local Jurisdiction    
Deferred tax assets    
Federal net operating loss carryforwards   708,900
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   $ 7,100