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Equity awards (Tables)
 3 Months Ended
Mar. 31, 2016
Equity awards [Abstract]  
Option Award Activity
The following is a summary of stock option award activity under the Emergent Plans:

  
2006 Plan
  
2004 Plan
    
  
Number of Shares
  
Weighted-Average Exercise Price
  
Number of Shares
  
Weighted-Average Exercise Price
  
Aggregate Intrinsic Value
 
Outstanding at December 31, 2015
  
2,964,237
  
$
22.73
   
29,699
  
$
10.28
  
$
52,119,607
 
Granted
  
391,158
  
$
33.83
   
-
  
$
-
     
Exercised
  
(178,124
)
 
$
18.47
   
(29,699
)
 
$
10.28
     
Forfeited
  
(12,742
)
 
$
25.48
   
-
  
$
-
     
Outstanding at March 31, 2016
  
3,164,529
  
$
24.33
   
-
  
$
-
  
$
38,049,150
 
Exercisable at March 31, 2016
  
1,951,044
  
$
21.12
   
-
  
$
-
  
$
29,719,065
 
Restricted Stock Units Activity
The following is a summary of restricted stock unit award activity under the 2006 Plan:

  
Number of Shares
  
Weighted-Average Grant Price
  
Aggregate Intrinsic Value
 
Outstanding at December 31, 2015
  
889,004
  
$
26.86
  
$
35,569,048
 
Granted
  
427,592
  
$
33.83
     
Vested
  
(353,117
)
 
$
24.70
     
Forfeited
  
(9,599
)
 
$
30.06
     
Outstanding at March 31, 2016
  
953,880
  
$
30.75
  
$
34,673,539