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Unconsolidated Subsidiaries (Tables)
 12 Months Ended
Dec. 31, 2015
Equity Method Investments and Joint Ventures [Abstract]  
Condensed Financial Statements
Summarized financial information for the unconsolidated subsidiaries is as follows:
 
2015
 
2014
 
2013
Statement of Operations
 
 
 
 
 
Revenues
$
608,349

 
$
579,031

 
$
577,436

Gross profit
$
71,727

 
$
74,244

 
$
74,870

Income before income taxes
$
49,641

 
$
48,592

 
$
47,953

Net income
$
39,181

 
$
37,067

 
$
37,468

Balance Sheet
 
 
 
 
 
Current assets
$
160,498

 
$
143,105

 
 
Non-current assets
$
913,402

 
$
781,475

 
 
Current liabilities
$
129,126

 
$
177,659

 
 
Non-current liabilities
$
940,782

 
$
742,938