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CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) (Parenthetical) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Current assets:    
Trade accounts receivable, allowance for doubtful accounts $ 10,116 $ 9,364
Other intangible assets accumulated amortization 93,910 85,098
LIABILITIES AND EQUITY    
Current maturities and unamortized debt issuance costs $ 602 $ 2,046
Shareholders' equity:    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 100,000,000 100,000,000
Common stock shares issued (in shares) 14,655,356 14,655,356
Common stock shares outstanding (in shares) 14,655,356 14,655,356
Treasury stock (in shares) 142,900 264,297
Series A Preferred Stock [Member]    
Shareholders' equity:    
Preferred stock, voting rights 1/10th vote per share 1/10th vote per share
Preferred stock, par value (in dollars per share) $ 1.00 $ 1.00
Preferred stock, liquidation preference (in dollars per share) $ 112 $ 100
Preferred stock, authorized (in shares) 1,000,000 1,000,000
Preferred stock, issued (in shares) 1,122 1,122
Preferred stock, outstanding (in shares) 1,122 1,122
Series B Convertible Preferred Stock [Member]    
Shareholders' equity:    
Preferred stock, voting rights 1/10th vote per share 1/10th vote per share
Preferred stock, par value (in dollars per share) $ 1.00 $ 1.00
Preferred stock, stated value (in dollars per share) 100 100
Preferred stock, liquidation preference (in dollars per share) $ 1,500 $ 1,500
Preferred stock, authorized (in shares) 1,000,000 1,000,000
Preferred stock, issued (in shares) 15,000 15,000
Preferred stock, outstanding (in shares) 15,000 15,000