Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Accounts receivable, allowances	$ 3,998	$ 3,881
Property, plant and equipment, accumulated depreciation	140,444	137,879
Accumulated amortization on intangible assets	$ 7,831	$ 7,048
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	60,000,000	60,000,000
Common stock, shares issued (in shares)	29,873,953	29,871,354
Common stock, shares outstanding (in shares)	29,873,953	29,871,354
Treasury stock, shares (in shares)	1,014,413	1,014,413