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Unconsolidated Subsidiaries (Tables)
9 Months Ended
Sep. 30, 2017
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
 
NINE MONTHS ENDED
 
SEPTEMBER 30
 
SEPTEMBER 30
 
2017
 
2016
 
2017
 
2016
Revenues
$
203,134

 
$
178,009

 
$
571,862

 
$
483,360

Gross profit
$
23,126

 
$
21,367

 
$
64,981

 
$
59,788

Income before income taxes
$
16,602

 
$
14,755

 
$
45,928

 
$
41,122