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Earnings per share (Tables)
 9 Months Ended
Sep. 30, 2016
Earnings per share [Abstract]  
Summary of Basic and Diluted Net Income (Loss) per Share
The following table presents the calculation of basic and diluted net income (loss) per share:

  
Three Months Ended September 30,
  
Nine Months Ended September 30,
 
(in thousands, except share and per share data)
 
2016
  
2015
  
2016
  
2015
 
Numerator:
            
Net income from continuing operations
 
$
20,388
  
$
42,088
  
$
30,238
  
$
48,925
 
Interest expense, net of tax
  
934
   
786
   
2,234
   
2,378
 
Amortization of debt issuance costs, net of tax
  
183
   
215
   
569
   
671
 
Net income, adjusted from continuing operations
  
21,505
   
43,089
   
33,041
   
51,974
 
Income (loss) from discontinued operations
  
952
   
(5,145
)
  
(15,854
)
  
(19,402
)
Net income, adjusted
 
$
22,457
  
$
37,944
  
$
17,187
  
$
32,572
 
                 
Denominator:
                
Weighted-average number of shares—basic
  
40,465,423
   
38,831,341
   
40,071,730
   
38,423,715
 
Dilutive securities—equity awards
  
878,390
   
1,232,684
   
658,367
   
813,939
 
Dilutive securities—convertible debt
  
8,096,500
   
7,720,525
   
8,096,500
   
7,720,525
 
Weighted-average number of shares—diluted
  
49,440,313
   
47,784,550
   
48,826,597
   
46,958,179
 
                 
Net income per share-basic from continuing operations
 
$
0.50
  
$
1.08
  
$
0.75
  
$
1.28
 
Income (loss) per share-basic from discontinued operations
  
0.02
   
(0.14
)
  
(0.40
)
  
(0.51
)
Net income per share-basic
 
$
0.52
  
$
0.94
  
$
0.35
  
$
0.77
 
                 
Net income per share-diluted from continuing operations
 
$
0.43
  
$
0.90
  
$
0.68
  
$
1.11
 
Income (loss) per share-diluted from discontinued operations
  
0.02
   
(0.11
)
  
(0.32
)
  
(0.42
)
Net income per share-diluted
 
$
0.45
  
$
0.79
  
$
0.36
  
$
0.69