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Note 13 - Income Taxes (Tables)
12 Months Ended
Dec. 31, 2014
Income Tax Disclosure [Abstract]  
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
   

Year Ended December 31,

 
   

2014

   

2013

   

2012

 

Current:

                       

Federal

  $ 38,161     $ 48,287     $ 34,170  

State

    1,645       5,648       3,854  

Foreign

    5,701       2,214       81  
      45,507       56,149       38,105  

Deferred:

                       

Federal

    42,474       42,003       21,972  

State

    (3,134 )     5,523       3,048  

Foreign

    (1,462 )     167       25  
      37,878       47,693       25,045  

Change in valuation allowance

    364       335       (21 )

Provision for income taxes

  $ 83,749     $ 104,177     $ 63,129  
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
   

December 31,

 
   

2014

   

2013

 

Deferred tax assets:

               

Goodwill and intangible assets

  $ 23,624     $ 74,992  

Accrued expenses

    18,191       24,263  

Deferred revenue

    7,945       4,413  

Inventories

    6,306       4,483  

Pension obligations

    8,738       4,043  

Stock-based compensation

    8,628       6,609  

Operating loss and credit carryforwards

    10,047       976  

Other

    4,299       2,089  

Valuation allowance

    (1,385 )     (1,021 )

Total deferred tax assets

    86,393       120,847  
                 

Deferred tax liabilities:

               

Depreciation

    18,535       15,163  

Debt refinancing costs

    10,925       7,494  

Prepaid expenses

    1,032       1,183  

Total deferred tax liabilities

    30,492       23,840  

Net deferred tax assets

  $ 55,901     $ 97,007  
Net Current and Noncurrent Components of Deferred Taxes [Table Text Block]
   

December 31,

 
   

2014

   

2013

 

Net current deferred tax assets

  $ 22,841     $ 26,869  

Net long-term deferred tax assets

    47,894       86,125  
Net long-term deferred tax liabilities     (13,449 )     (14,966 )

Valuation allowance

    (1,385 )     (1,021 )

Net deferred tax assets

  $ 55,901     $ 97,007  
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]
   

December 31,

 
   

2014

 

Unrecognized tax benefit, beginning of period

  $ -  

Increase in unrecognized tax benefit for positions taken in current period

    6,394  

Unrecognized tax benefit, end of period

  $ 6,394  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
   

Year Ended December 31,

 
   

2014

   

2013

   

2012

 
                         

U.S. statutory rate

    35.0 %     35.0 %     35.0 %

State taxes

    3.1       3.7       4.1  

Valuation allowance

    0.2       0.2       -  

Research and development credits

    (5.0 )     (0.6 )     (0.2 )

Other

    (0.9 )     (0.9 )     1.5  

Effective tax rate

    32.4 %     37.4 %     40.4 %