CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) (Parenthetical) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Current assets:
Trade accounts receivable, allowance for doubtful accounts	$ 8,966	$ 8,160
Other intangible assets accumulated amortization	76,443	70,027
Current liabilities:
Unamortized debt issuance costs - current	$ 744
Unamortized debt issuance costs - noncurrent		$ 922
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)	17,401,724	17,197,380
Common stock shares outstanding (in shares)	17,401,724	17,197,380
Series A Preferred Stock [Member]
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	112
Preferred stock, stated value (in dollars per share)	$ 100	$ 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]
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)	1,500	1,500
Preferred stock, stated value (in dollars per share)	$ 100	$ 100
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