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Debt (Tables)
6 Months Ended
Jun. 30, 2017
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments [Table Text Block]
 
June 30, 2017
 
December 31, 2016
Term loan with SunTrust, interest payable quarterly
$
144,375

 
$
148,125

Credit facility with SunTrust
135,000

 
122,000

Mortgage loans and promissory note, principal and interest payable monthly, interest at fixed rate
13,731

 
14,032

 
293,106

 
284,157

Less: current maturities
(8,165
)
 
(8,129
)
Less: debt issuance costs
(476
)
 
(542
)
 
$
284,465

 
$
275,486