Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Accounts receivable, allowances	$ 4,180	$ 4,539
Property, plant and equipment, accumulated depreciation	136,116	134,598
Accumulated amortization on intangible assets	$ 6,129	$ 5,838
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)	29,448,779	29,448,779
Common stock, shares outstanding (in shares)	29,448,779	29,448,779
Treasury stock, shares (in shares)	879,404	879,404