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Income taxes (Tables)
12 Months Ended
Dec. 31, 2017
Income taxes [Abstract]  
Components of the provision for income taxes attributable to operations
Significant components of the provisions for income taxes attributable to operations consist of the following:

  
Year Ended December 31,
 
(in thousands)
 
2017
  
2016
  
2015
 
Current
         
Federal
 
$
29,441
  
$
29,244
  
$
38,957
 
State
  
2,983
   
2,331
   
2,221
 
International
  
356
   
1,002
   
2,029
 
Total current
  
32,780
   
32,577
   
43,207
 
Deferred
            
Federal
  
(6,045
)
  
9,979
   
(119
)
State
  
(592
)
  
(272
)
  
(111
)
International
  
9,896
   
(5,587
)
  
1,323
 
Total deferred
  
3,259
   
4,120
   
1,093
 
Total provision for income taxes
 
$
36,039
  
$
36,697
  
$
44,300
 

Net deferred tax asset
The Company's net deferred tax asset (liability) consists of the following:

  
December 31,
 
(in thousands)
 
2017
  
2016
 
Federal losses carryforward
 
$
1,603
  
$
4,130
 
State losses carryforward
  
17,234
   
13,682
 
Research and development carryforward
  
3,534
   
3,647
 
Scientific research and experimental development credit carryforward
  
16,493
   
16,594
 
Stock compensation
  
5,344
   
8,389
 
Foreign deferrals
  
34,072
   
58,647
 
Inventory reserves
  
1,607
   
2,273
 
Other
  
3,889
   
5,569
 
Deferred tax asset
  
83,776
   
112,931
 
Fixed assets
  
(23,121
)
  
(30,728
)
Intangible assets
  
(2,229
)
  
(5,882
)
Other
  
(10,451
)
  
(16,047
)
Deferred tax liability
  
(35,801
)
  
(52,657
)
Valuation allowance
  
(45,141
)
  
(54,178
)
Net deferred tax asset
 
$
2,834
  
$
6,096
 

Reconciliation of taxes determined by applying U.S. federal statutory rate to loss before provision for income taxes
The provision for income taxes differs from the amount of taxes determined by applying the U.S. federal statutory rate to income before the provision for income taxes as a result of the following:

  
Year ended December 31,
 
(in thousands)
 
2017
  
2016
  
2015
 
US
 
$
80,690
  
$
63,330
  
$
117,385
 
International
  
37,943
   
35,891
   
18,331
 
Earnings before taxes on income
  
118,633
   
99,221
   
135,716
 
             
Federal tax at statutory rates
 
$
41,522
  
$
34,738
  
$
47,475
 
State taxes, net of federal benefit
  
1,274
   
529
   
852
 
Impact of foreign operations
  
(2,168
)
  
(9,937
)
  
(1,640
)
Change in valuation allowance
  
314
   
10,458
   
(950
)
Tax credits
  
(1,918
)
  
(1,572
)
  
(2,088
)
Transition tax
  
13,585
   
-
   
-
 
Change in U.S. tax rate
  
(13,403
)
  
-
   
-
 
Stock compensation
  
(3,978
)
  
-
   
-
 
Other differences
  
(118
)
  
1,103
   
733
 
Permanent differences
  
929
   
1,378
   
(82
)
Provision for income taxes
 
$
36,039
  
$
36,697
  
$
44,300
 

Gross unrecognized tax benefits activity
The table below presents the gross unrecognized tax benefits activity for 2017, 2016 and 2015:

(in thousands)
   
Gross unrecognized tax benefits at December 31, 2014
 
$
1,248
 
Increases for tax positions for prior years
  
150
 
Decreases for tax positions for prior years
  
-
 
Increases for tax positions for current year
  
59
 
Settlements
  
-
 
Lapse of statute of limitations
  
-
 
Gross unrecognized tax benefits at December 31, 2015
  
1,457
 
Increases for tax positions for prior years
  
5
 
Decreases for tax positions for prior years
  
-
 
Increases for tax positions for current year
  
299
 
Settlements
  
-
 
Lapse of statute of limitations
  
-
 
Gross unrecognized tax benefits at December 31, 2016
  
1,761
 
Increases for tax positions for prior years
  
-
 
Decreases for tax positions for prior years
  
-
 
Increases for tax positions for current year
  
531
 
Settlements
  
(318
)
Lapse of statute of limitations
  
-
 
Gross unrecognized tax benefits at December 31, 2017
 
$
1,974