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Quarterly Financial Data -- Unaudited (Tables)
 12 Months Ended
Dec. 31, 2016
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
2016
 
 
 
 
 
 
 
Total revenue
$
1,201,010

 
$
1,235,566

 
$
1,277,646

 
$
1,302,998

Cost of services
$
(467,028
)
 
$
(486,317
)
 
$
(488,659
)
 
$
(551,323
)
Income from operations
$
348,234

 
$
362,156

 
$
392,179

 
$
329,560

Net income (2)
$
172,440

 
$
174,965

 
$
193,901

 
$
204,627

Net income per common share--basic (2)
$
0.03

 
$
0.04

 
$
0.04

 
$
0.04

Net income per common share--diluted (2)
$
0.03

 
$
0.04

 
$
0.04

 
$
0.04

2015
 
 
 
 
 
 
 
Total revenue
$
1,080,990

 
$
1,123,210

 
$
1,169,712

 
$
1,196,146

Cost of services
$
(406,370
)
 
$
(525,463
)
 
$
(440,808
)
 
$
(470,523
)
Income from operations
$
313,806

 
$
219,429

 
$
351,584

 
$
293,869

Net income
$
105,692

 
$
102,849

 
$
166,550

 
$
134,633

Net income per common share--basic (1)
$
0.02

 
$
0.02

 
$
0.03

 
$
0.03

Net income per common share--diluted (1)
$
0.02

 
$
0.02

 
$
0.03

 
$
0.03


(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.
(2)
These amounts reflect the adoption of ASU 2016-09, Compensation-Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting.