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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Contingency [Line Items]          
Gross federal NOL carryforward $ 1,000,000 $ 1,000,000      
Valuation allowance adjustment 49,600   $ (45,600) $ 2,100,000  
unrecognized tax benefits in equity share based payment   19400      
Deferred Income Tax Expense (Benefit)   $ 311,699 223,769 (2,096,423)  
Gross unrecognized tax benefits 38,992 38,992 32,911 $ 173,310 $ 170,425
Income tax liabilities 57,050 57,050 48,722    
Possible decrease in unrecognized tax benefits 35,000 35,000      
Unrecognized tax benefits, income tax penalties and interest accrued 17,200 $ 17,200 $ 17,300    
Minimum [Member]          
Income Tax Contingency [Line Items]          
IncomeTaxNetOperatingLossCarryforwardPeriod   5 years      
Operating loss carryforwards, expiration dates   Jan. 01, 2028      
Income tax examination, year(s) under examination   2005      
Maximum [Member]          
Income Tax Contingency [Line Items]          
IncomeTaxNetOperatingLossCarryforwardPeriod   20 years      
Operating loss carryforwards, expiration dates   Jan. 01, 2032      
Income tax examination, year(s) under examination   2015      
2016 to 2020 [Member] | Minimum [Member]          
Income Tax Contingency [Line Items]          
Operating loss carryforwards, expiration dates   Jan. 01, 2016      
2016 to 2020 [Member] | Maximum [Member]          
Income Tax Contingency [Line Items]          
Operating loss carryforwards, expiration dates   Jan. 01, 2020      
2016 to 2020 [Member] | State and Local Jurisdiction [Member]          
Income Tax Contingency [Line Items]          
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration 32,200 $ 32,200      
2021 to 2025 [Member] | Minimum [Member]          
Income Tax Contingency [Line Items]          
Operating loss carryforwards, expiration dates   Jan. 01, 2021      
2021 to 2025 [Member] | Maximum [Member]          
Income Tax Contingency [Line Items]          
Operating loss carryforwards, expiration dates   Jan. 01, 2025      
2021 to 2025 [Member] | State and Local Jurisdiction [Member]          
Income Tax Contingency [Line Items]          
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration 46,100 $ 46,100      
2026 to 2035 [Member] | Minimum [Member]          
Income Tax Contingency [Line Items]          
Operating loss carryforwards, expiration dates   Jan. 01, 2026      
2026 to 2035 [Member] | Maximum [Member]          
Income Tax Contingency [Line Items]          
Operating loss carryforwards, expiration dates   Jan. 01, 2035      
2026 to 2035 [Member] | State and Local Jurisdiction [Member]          
Income Tax Contingency [Line Items]          
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration $ 196,400 $ 196,400