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Debt (Tables)
 12 Months Ended
Dec. 31, 2017
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments [Table Text Block]
Long-term debt consists of the following:
 
December 31,
 
2017
 
2016
Term loan with SunTrust, interest payable quarterly
$
140,625

 
$
148,125

Credit facility with SunTrust
50,000

 
122,000

Mortgage loans and promissory note, principal and interest payable monthly, interest at fixed rate
125,394

 
14,032

 
316,019

 
284,157

Less: current maturities
(9,939
)
 
(8,129
)
Less: debt issuance costs
(3,090
)
 
(542
)
 
$
302,990

 
$
275,486