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Earnings per share (Tables)
 12 Months Ended
Dec. 31, 2017
Earnings per share [Abstract]  
Summary of basic and diluted net income per share
The following table presents the calculation of basic and diluted net income per share:

  
Years ended December 31,
 
(in thousands, except share and per share data)
 
2017
  
2016
  
2015
 
Numerator:
         
Net income from continuing operations
 
$
82,594
  
$
62,524
  
$
91,416
 
Interest expense, net of tax
  
2,606
   
3,255
   
3,019
 
Amortization of debt issuance costs, net of tax
  
681
   
781
   
868
 
Net income, adjusted from continuing operations
  
85,881
   
66,560
   
95,303
 
Net loss from discontinued operations
  
-
   
(10,748
)
  
(28,546
)
Net income, adjusted
 
$
85,881
  
$
55,812
  
$
66,757
 
             
Denominator:
            
Weighted-average number of shares-basic
  
41,816,431
   
40,184,159
   
38,595,435
 
Dilutive securities-equity awards
  
1,115,244
   
1,054,453
   
939,882
 
Dilutive securities-convertible debt
  
7,396,262
   
8,096,500
   
7,720,525
 
Weighted-average number of shares-diluted
  
50,327,937
   
49,335,112
   
47,255,842
 
             
Net income per share-basic from continuing operations
 
$
1.98
  
$
1.56
  
$
2.37
 
Net loss per share-basic from discontinued operations
  
-
   
(0.27
)
  
(0.74
)
Net income per share-basic
 
$
1.98
  
$
1.29
  
$
1.63
 
             
Net income per share-diluted from continuing operations
 
$
1.71
  
$
1.35
  
$
2.02
 
Net loss per share-diluted from discontinued operations
  
-
   
(0.22
)
  
(0.61
)
Net income per share-diluted
 
$
1.71
  
$
1.13
  
$
1.41