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Unconsolidated Subsidiaries (Tables)
9 Months Ended
Sep. 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
 
NINE MONTHS ENDED
 
SEPTEMBER 30
 
SEPTEMBER 30
 
2018
 
2017
 
2018
 
2017
Revenues
$
205,838

 
$
203,134

 
$
570,902

 
$
571,862

Gross profit
$
22,359

 
$
23,126

 
$
63,827

 
$
64,981

Income before income taxes
$
17,408

 
$
16,602

 
$
48,986

 
$
45,928