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Selected Quarterly Financial Data - Unaudited (Tables)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Data - Unaudited [Abstract]  
Schedule of Quarterly Financial Information [Table Text Block]
 
 
Quarter Ended
 
 
Mar. 31
 
Jun. 30
 
Sept. 30
 
Dec. 31
 
 
(in thousands except per share data)
2017
 
 

 
 

 
 

 
 

Total revenue
 
$
247,739

 
$
331,514

 
$
343,236

 
$
370,124

Gross profit
 
$
88,945

 
$
88,062

 
$
111,598

 
$
137,490

Net income (loss)
 
$
55,863

 
$
(37,060
)
 
$
136

 
$
49,705

Net income (loss) per share:
 
 

 
 

 
 

 
 

Basic
 
$
3.03

 
$
(1.87
)
 
$
0.01

 
$
2.47

Diluted
 
$
2.86

 
$
(1.87
)
 
$
0.01

 
$
2.33

2016
 
 

 
 

 
 

 
 

Total revenue
 
$
89,855

 
$
96,721

 
$
97,108

 
$
95,688

Gross profit
 
$
49,233

 
$
50,132

 
$
51,273

 
$
50,760

Net income
 
$
18,160

 
$
16,606

 
$
18,806

 
$
9,512

Net income per share:
 
 

 
 

 
 

 
 

Basic
 
$
1.13

 
$
1.03

 
$
1.16

 
$
0.58

Diluted
 
$
1.08

 
$
0.98

 
$
1.09

 
$
0.54


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On February 3, 2017, we acquired HIS, see Note 2, Acquisitions, Strategic Transaction and Integration Costs.