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Quarterly Results (Unaudited) (Tables)
12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information
Selected quarterly financial information follows for the years ended December 31, 2018 and 2017 (in thousands, except share and per share amounts):
 
March 31, 2018
 
June 30, 2018
 
September 30, 2018
 
December 31, 2018
Revenue
$
463,657

 
$
489,699

 
$
471,585

 
$
478,241

Gross profit
113,544

 
126,037

 
113,040

 
120,634

Income from operations
55,284

 
64,624

 
55,460

 
63,727

Net income
37,298

 
40,426

 
33,600

 
46,657

Allocation of net income to common stockholders:
 
 
 
 
 
 
 
Common stock—basic
37,100

 
40,196

 
33,409

 
46,391

Common stock—diluted
37,104

 
40,200

 
33,413

 
46,397

Earnings per common share:
 
 
 
 
 
 
 
Common stock—basic
$
0.64

 
$
0.70

 
$
0.58

 
$
0.80

Common stock—diluted
$
0.62

 
$
0.68

 
$
0.57

 
$
0.79

 
March 31, 2017
 
June 30, 2017
 
September 30, 2017
 
December 31, 2017
Revenue
$
422,164

 
$
445,546

 
$
433,316

 
$
439,879

Gross profit
104,934

 
114,341

 
103,194

 
108,141

Income from operations
51,404

 
56,806

 
44,963

 
52,266

Net income (1)
41,374

 
33,040

 
31,105

 
51,444

Allocation of net income to common stockholders:
 
 
 
 
 
 
 
Common stock—basic
41,151

 
32,828

 
30,905

 
51,111

Common stock—diluted
41,157

 
32,833

 
30,909

 
51,117

Earnings per common share:
 
 
 
 
 
 
 
Common stock—basic
$
0.69

 
$
0.56

 
$
0.53

 
$
0.88

Common stock—diluted
$
0.68

 
$
0.54

 
$
0.51

 
$
0.86