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Note 13 - Income Taxes (Tables)
12 Months Ended
Dec. 31, 2015
Notes Tables  
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
 
 
Year Ended December 31,
 
 
 
2015
 
 
2014
 
 
2013
 
Current:
                       
Federal
  $ 13,614     $ 38,161     $ 48,287  
State
    1,966       1,645       5,648  
Foreign
    3,588       5,701       2,214  
      19,168       45,507       56,149  
Deferred:
                       
Federal
  $ 31,869     $ 42,474     $ 42,003  
State
    1,387       (3,134 )     5,523  
Foreign
    (7,326 )     (1,462 )     167  
      25,930       37,878       47,693  
Change in valuation allowance
    138       364       335  
Provision for income taxes
  $ 45,236     $ 83,749     $ 104,177  
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
 
 
December 31,
 
 
 
2015
 
 
2014
 
Deferred tax assets:
               
Goodwill and intangible assets
  $ -     $ 23,624  
Accrued expenses
    18,982       18,191  
Deferred revenue
    9,389       7,945  
Inventories
    9,772       9,177  
Pension obligations
    7,684       8,738  
Stock-based compensation
    7,974       8,628  
Operating loss and credit carryforwards
    15,677       10,047  
Other
    2,842       1,428  
Valuation allowance
    (1,523 )     (1,385 )
Total deferred tax assets
    70,797       86,393  
                 
Deferred tax liabilitites:
               
Goodwill and intangible assets
    12,455       -  
Depreciation
    19,507       18,535  
Debt refinancing costs
    7,732       10,925  
Prepaid expenses
    1,241       1,032  
Total deferred tax liabilities
    40,935       30,492  
Net deferred tax assets
  $ 29,862     $ 55,901  
Net Current and Noncurrent Components of Deferred Taxes [Table Text Block]
 
 
December 31,
 
 
 
2015
 
 
2014
 
                 
Net current deferred tax assets
  $ 29,355     $ 22,841  
Net long-term deferred tax assets
    8,196       47,894  
Net long-term deferred tax liabilitites
    (6,166 )     (13,449 )
Valuation allowance
    (1,523 )     (1,385 )
Net deferred tax assets
  $ 29,862     $ 55,901  
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]
 
 
December 31,
 
 
 
2015
 
 
2014
 
                 
Unrecognized tax benefit, beginning of period
  $ 6,394     $ -  
Increase in unrecognized tax benefit for positions taken in current period
    845       6,394  
Unrecognized tax benefit, end of period
  $ 7,239     $ 6,394  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
 
 
Year Ended December 31,
 
 
 
2015
 
 
2014
 
 
2013
 
                         
U.S. stautory rate
    35.0 %     35.0 %     35.0 %
State taxes
    4.1       3.1       3.7  
Valuation allowance
    0.6       0.2       0.2  
Research and development credits
    (2.3 )     (5.0 )     (0.6 )
Other
    (0.6 )     (0.9 )     (0.9 )
Effective tax rate
    36.8 %     32.4 %     37.4 %