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Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]  
Summary of Quarterly Financial Data
 
Quarter ended
 
March 31
 
June 30
 
September 30
 
December 31
2015
 
 
 
 
 
 
 
Total revenues
$
625,578

 
$
640,007

 
$
668,008

 
$
725,695

Insurance costs
$
483,203

 
$
517,994

 
$
534,481

 
$
576,698

Operating income
$
31,041

 
$
5,985

 
$
11,682

 
$
29,609

Net income (loss)
$
15,811

 
$
(1,308
)
 
$
3,097

 
$
14,095

Basic net income (loss) per share
$
0.23

 
$
(0.02
)
 
$
0.04

 
$
0.20

Diluted net income (loss) per share
$
0.22

 
$
(0.02
)
 
$
0.04

 
$
0.20

2014
 
 
 
 
 
 
 
Total revenues
$
508,912

 
$
525,006

 
$
555,951

 
$
603,662

Insurance costs
$
381,157

 
$
400,195

 
$
428,184

 
$
476,779

Operating income
$
25,277

 
$
20,029

 
$
21,246

 
$
20,239

Net income
$
1,540

 
$
6,221

 
$
725

(1) 
$
7,011

Basic net income per share
$
0.03

 
$
0.09

 
$
0.01

 
$
0.10

Diluted net income per share
$
0.03

 
$
0.09

 
$
0.01

 
$
0.10


(1)    Included in the results of the third quarter of 2014 is the write-off of debt issuance costs and pre-payment premium as a result of the Company’s amended and restated first lien credit facility. Please read Note 8, “Notes Payable and Borrowings Under Capital Leases,” for additional information.