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Unconsolidated Subsidiaries (Tables)
9 Months Ended
Sep. 30, 2015
Equity Method Investments and Joint Ventures [Abstract]  
Schedule of Variable Interest Entities
Summarized financial information for the unconsolidated subsidiaries is as follows:
 
THREE MONTHS ENDED
 
NINE MONTHS ENDED
 
SEPTEMBER 30
 
SEPTEMBER 30
 
2015
 
2014
 
2015
 
2014
Revenues
$
154,545

 
$
150,529

 
$
457,719

 
$
437,127

Gross profit
$
18,112

 
$
19,504

 
$
55,057

 
$
56,123

Income before income taxes
$
12,571

 
$
12,201

 
$
38,221

 
$
36,363

Net income
$
9,777

 
$
9,372

 
$
29,495

 
$
28,046