Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Receivables, allowance	$ 12,582	$ 15,182
Intangible assets, accumulated amortization	$ 92,993	$ 82,406
Preferred stock, shares authorized (in shares)	500,000	500,000
Preferred stock, shares issued (in shares)	0	0
Common stock, par value (in usd per share)	$ 0.30	$ 0.30
Common stock, shares authorized (in shares)	60,000,000	60,000,000
Common stock, shares issued (in shares)	30,339,999	30,184,330