Supplemental Financial Information (Quarterly Unaudited Financial Data) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Supplemental Financial Information [Abstract]
Net sales	$ 188,835	$ 217,412	$ 224,519	$ 196,801	$ 172,639	$ 205,514	$ 219,734	$ 192,171	$ 827,567	$ 790,058	$ 766,607
Gross profit	35,452	41,762	44,706	36,177	32,125	40,228	41,726	35,481	158,097	149,560	145,115
Income (loss) from operations	6,153	(6,152)	16,283	5,196	1,196	15,749	16,293	7,023	21,480	40,261	36,158
Interest expense	3,811	3,828	3,690	11,160	4,593	4,688	4,627	4,674	22,489	18,582	19,363
(Loss) income from continuing operations	4,009	(13,727)	7,732	(3,643)	(3,736)	7,022	7,915	1,449	(5,629)	12,650	9,216
(Loss) income from discontinued operations				(4)	(188)	279	(9)	(87)	(4)	(5)	7,307
Net (loss) income	$ 4,009	$ (13,727)	$ 7,732	$ (3,647)	$ (3,924)	$ 7,301	$ 7,906	$ 1,362	$ (5,633)	$ 12,645	$ 16,523
Income (loss) per share from continuing operations: Basic	$ 0.13	$ (0.44)	$ 0.25	$ (0.12)	$ (0.12)	$ 0.23	$ 0.26	$ 0.05	$ (0.18)	$ 0.41	$ 0.30
Income (loss) per share from continuing operations: Diluted	$ 0.13	$ (0.44)	$ 0.25	$ (0.12)	$ (0.12)	$ 0.23	$ 0.26	$ 0.05	$ (0.18)	$ 0.41	$ 0.30
(Loss) Income per share from discontinued operations: Basic	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ (0.01)	$ 0.01	$ 0.00	$ (0.01)	$ 0.00	$ 0.00	$ 0.24
(Loss) income per share from discontinued operations: Diluted	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ (0.01)	$ 0.01	$ 0.00	$ (0.01)	$ 0.00	$ 0.00	$ 0.24