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Unconsolidated Subsidiaries (Tables)
6 Months Ended
Jun. 30, 2018
Equity Method Investments and Joint Ventures [Abstract]  
Schedule of Financial Information for Unconsolidated Subsidiaries
Summarized financial information for the unconsolidated subsidiaries is as follows:
 
THREE MONTHS ENDED
 
SIX MONTHS ENDED
 
JUNE 30
 
JUNE 30
 
2018
 
2017
 
2018
 
2017
Revenues
$
182,018

 
$
174,554

 
$
365,064

 
$
368,728

Gross profit
$
20,405

 
$
19,857

 
$
41,468

 
$
41,854

Income before income taxes
$
15,456

 
$
13,616

 
$
31,578

 
$
29,326