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Unconsolidated Subsidiaries (Tables)
3 Months Ended
Mar. 31, 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
 
MARCH 31
 
2018
 
2017
Revenues
$
183,046

 
$
194,174

Gross profit
$
21,144

 
$
21,997

Income before income taxes
$
16,122

 
$
15,710