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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2014
Income Taxes [Abstract]  
Summary of company's benefit for income taxes

  Year Ended December 31, 
  2014  2013  2012 
Current $252  $301  $708 
             
Federal  (77,986)  74,713   89,788 
State  (10,558)  12,851   12,144 
Deferred  (88,544)  87,564   101,932 
Total ($88,292) $87,865  $102,640 

 

Summary of reconciliation of the federal statutory rate

 

  Year Ended December 31, 
  2014  2013  2012 
Computed expected tax (benefit) expense ($86,853) $69,788  $65,332 
State income taxes, net of federal (benefit) expense  (6,968)  8,482   8,015 
Share-based compensation  10,201   10,526   9,766 
Research and development tax credit  (19,405)  (21,887)  (10,813)
Other  14,733   20,956   30,340 
Total income tax (benefit) expense ($88,292) $87,865  $102,640 
Schedule of deferred tax asset

  As of December 31, 
  2014  2013 
Product rights $130,036  $165,527 
Property, plant and equipment  225,229   52,094 
Research and development tax credit  266,078   235,567 
Federal net operating loss carryforward  464,998   525,012 
State net operating loss carryforward  165,901   201,698 
Interest rate swap  15,486   13,166 
Prepaid expenses and other  (6,925)  (23,171)
Deferred tax asset $1,260,803  $1,169,893