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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Jun. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Income Tax Contingency [Line Items]          
Income tax credits and adjustments   $ 880      
Provision for income taxes 15,731   5,803 19,384 11,924
Federal Tax Authority
          
Income Tax Contingency [Line Items]          
Income tax credits and adjustments 41,171        
Other deferred tax liabilities 14,410     14,410  
State Tax Authority
          
Income Tax Contingency [Line Items]          
Income tax credits and adjustments       83,524  
Provision for income taxes       4,799  
2014 Federal and State Repairs and Maintenance Deduction [Member]
          
Income Tax Contingency [Line Items]          
Income tax credits and adjustments       19,395  
2014 Federal and State Repairs and Maintenance Deduction [Member] | Federal Tax Authority
          
Income Tax Contingency [Line Items]          
Other deferred tax liabilities 5,091     5,091  
2014 Federal and State Repairs and Maintenance Deduction [Member] | State Tax Authority
          
Income Tax Contingency [Line Items]          
Provision for income taxes       $ (853)