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Income taxes (Tables)
12 Months Ended
Dec. 31, 2016
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)
 
2016
  
2015
  
2014
 
Current
         
Federal
 
$
29,244
  
$
38,957
  
$
22,988
 
State
  
2,331
   
2,221
   
959
 
International
  
1,002
   
2,029
   
828
 
Total current
  
32,577
   
43,207
   
24,775
 
Deferred
            
Federal
  
9,979
   
(119
)
  
3,332
 
State
  
(272
)
  
(111
)
  
209
 
International
  
(5,587
)
  
1,323
   
1,612
 
Total deferred
  
4,120
   
1,093
   
5,153
 
Total provision for income taxes
 
$
36,697
  
$
44,300
  
$
29,928
 

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

  
December 31,
 
(in thousands)
 
2016
  
2015
 
Federal losses carryforward
 
$
4,130
  
$
5,394
 
State losses carryforward
  
13,682
   
12,751
 
Research and development carryforward
  
3,647
   
3,545
 
Scientific research and experimental development credit carryforward
  
16,594
   
25,771
 
Intangible assets
  
-
   
5,792
 
Stock compensation
  
8,389
   
9,391
 
Foreign deferrals
  
58,647
   
80,920
 
Inventory reserves
  
2,273
   
3,754
 
Other
  
5,569
   
8,484
 
Deferred tax asset
  
112,931
   
155,802
 
Fixed assets
  
(30,728
)
  
(31,925
)
Intangible assets
  
(5,882
)
  
(4,760
)
Other
  
(16,047
)
  
(17,192
)
Deferred tax liability
  
(52,657
)
  
(53,877
)
Valuation allowance
  
(54,178
)
  
(90,639
)
Net deferred tax (liabilities)/ asset
 
$
6,096
  
$
11,286
 

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 loss before provision for income taxes as a result of the following:

  
Year ended December 31,
 
(in thousands)
 
2016
  
2015
  
2014
 
US
 
$
63,330
  
$
117,385
  
$
76,909
 
International
  
35,891
   
18,331
   
7,285
 
Earnings before taxes on income
  
99,221
   
135,716
   
84,194
 
             
Federal tax at statutory rates
 
$
34,738
  
$
47,475
  
$
29,468
 
State taxes, net of federal benefit
  
529
   
852
   
650
 
Impact of foreign operations
  
(9,937
)
  
(1,640
)
  
(1,176
)
Change in valuation allowance
  
10,458
   
(950
)
  
1,091
 
Effect of foreign rates
  
(720
)
  
-
   
-
 
Tax credits
  
(1,572
)
  
(2,088
)
  
(1,743
)
Other differences
  
1,823
   
733
   
126
 
Permanent differences
  
1,378
   
(82
)
  
1,512
 
Provision for income taxes
 
$
36,697
  
$
44,300
  
$
29,928
 

Gross unrecognized tax benefits activity
The table below presents the gross unrecognized tax benefits activity for 2016, 2015 and 2014:

(in thousands)
   
Gross unrecognized tax benefits at December 31, 2013
 
$
1,121
 
Increases for tax positions for prior years
  
150
 
Decreases for tax positions for prior years
  
-
 
Increases for tax positions for current year
  
102
 
Settlements
  
-
 
Lapse of statute of limitations
  
(125
)
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