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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

  $ 56,342     $ 46,727     $ 31,438  

State

    7,944       5,539       3,626  
      64,286       52,266       35,064  

Deferred:

                       

Federal

    10,433       9,010       10,888  

State

    236       (702 )     3,110  
      10,669       8,308       13,998  

Total

  $ 74,955     $ 60,574     $ 49,062  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

Year Ended December 31,

 

2014

   

2013

   

2012

 

Federal tax provision at statutory rate

  $ 73,673     $ 58,026     $ 44,723  

State taxes, net of federal income tax benefit

    6,526       3,141       4,772  

Non-deductible expenses

    3,188       1,010       618  

Permanent differences related to the employee stock purchase program

    68       55       52  

Net change in valuation allowance

    (4,121 )     (554 )     (1,200 )

General business credits

    (4,002 )     (440 )     -  

Other

    (377 )     (664 )     97  

Income tax provision

  $ 74,955     $ 60,574     $ 49,062  
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

December 31,

 

2014

   

2013

 

Deferred tax assets:

               

Deferred revenue and cancellation reserves

  $ 31,539     $ 22,356  

Allowances and accruals, including state tax carryforward amounts

    28,553       17,561  

Interest on derivatives

    678       1,113  

Credits and other

    -       1,937  

Goodwill

    2,668       10,331  

Capital loss carryforward

    10,711       10,893  

Valuation allowance

    (8,663 )     (11,087 )

Total deferred tax assets

    65,486       53,104  
                 

Deferred tax liabilities:

               

Inventories

    (19,356 )     (6,722 )

Goodwill

    (21,320 )     -  

Property and equipment, principally due to differences in depreciation

    (67,271 )     (32,563 )

Prepaid expenses and other

    (2,936 )     (2,015 )

Total deferred tax liabilities

    (110,883 )     (41,300 )
                 

Total

  $ (45,397 )   $ 11,804  
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]

Balance, December 31, 2013

  $ -  

Acquired with acquisition

    1,495  

Balance, December 31, 2014

  $ 1,495