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Quarterly Financial Data -- Unaudited (Tables)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Schedule of quarterly financial information
Our quarterly results of operations are summarized below:
 
For the Three Months Ended
 
March 31
 
June 30
 
September 30
 
December 31
2018
 
 
 
 
 
 
 
Total revenue
$
1,375,102

 
$
1,432,299

 
$
1,467,383

 
$
1,495,908

Cost of services
$
(534,652
)
 
$
(636,668
)
 
$
(564,735
)
 
$
(572,551
)
Income from operations
$
423,591

 
$
361,627

 
$
482,557

 
$
459,173

Net income
$
289,441

 
$
292,352

 
$
343,048

 
$
251,052

Net income per common share--basic (1)
$
0.06

 
$
0.07

 
$
0.08

 
$
0.06

Net income per common share--diluted (1)
$
0.06

 
$
0.06

 
$
0.07

 
$
0.06

2017
 
 
 
 
 
 
 
Total revenue
$
1,294,066

 
$
1,347,569

 
$
1,379,596

 
$
1,403,898

Cost of services
$
(497,107
)
 
$
(513,446
)
 
$
(519,024
)
 
$
(572,405
)
Income from operations
$
393,840

 
$
416,353

 
$
433,965

 
$
396,706

Net income (loss)
$
207,073

 
$
202,109

 
$
275,722

 
$
(36,996
)
Net income (loss) per common share--basic (1)
$
0.04

 
$
0.04

 
$
0.06

 
$
(0.01
)
Net income (loss) per common share--diluted (1)
$
0.04

 
$
0.04

 
$
0.06

 
$
(0.01
)

(1)
The sum of quarterly net income per share applicable to common stockholders does not necessarily agree to the net income per share for the year due to rounding.