Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Receivables, allowance	$ 5,739	$ 3,548
Intangible assets, accumulated amortization	$ 28,511	$ 21,161
Preferred stock, shares authorized	500,000	500,000
Preferred stock, shares issued	0	0
Common stock, par value (in usd per share)	$ 0.30	$ 0.30
Common stock, shares authorized	60,000,000	60,000,000
Common stock, shares issued	30,148,278	21,836,694
Treasury stock at cost, shares	821,087	546,977