Guarantor Finanical Information Balance Sheet (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Cash and cash equivalents	$ 25,708	$ 30,829	$ 21,370	$ 21,607
Accounts receivable, less allowance for doubtful accounts	145,911	128,544
Receivables from affiliates	0	0
Inventories	213,846	214,900
Prepaid expenses and other current assets	16,911	16,418
Total current assets	402,376	390,691
Investment in joint venture	43,179	41,879
Goodwill	68,754	69,289
Intangible assets	65,968	69,489
Other assets	31,287	31,780
Investment in subsidiaries	0	0
Receivables from affiliates	0	0
Property, plant and equipment, net	75,214	76,694
Total assets	686,778	679,822
Accounts payable	88,274	69,577
Payables due to affiliates	0	0
Other current liabilities	35,914	31,367
Current portion of long-term debt	396	397
Total current liabilities	124,584	101,341
Long-term debt, less current portion	246,601	245,599
Payables due to affiliates	0	0
Deferred income taxes	10,149	10,733
Other non-current liabilities	11,727	12,255
Stockholders’ equity	293,717	309,894
Total liabilities and stockholders’ equity	686,778	679,822
Parent
Cash and cash equivalents	3,893	8,675	5,440	4,106
Accounts receivable, less allowance for doubtful accounts	78,266	67,536
Receivables from affiliates	3,475	2,811
Inventories	127,660	133,139
Prepaid expenses and other current assets	8,269	8,383
Total current assets	221,563	220,544
Investment in joint venture	43,179	41,879
Goodwill	41,504	41,504
Intangible assets	50,212	52,703
Other assets	27,733	28,145
Investment in subsidiaries	113,646	119,075
Receivables from affiliates	93,399	87,247
Property, plant and equipment, net	49,810	50,812
Total assets	641,046	641,909
Accounts payable	55,502	41,233
Payables due to affiliates	2,724	2,270
Other current liabilities	26,427	22,801
Current portion of long-term debt	371	371
Total current liabilities	85,024	66,675
Long-term debt, less current portion	246,571	245,561
Payables due to affiliates	0	0
Deferred income taxes	4,193	7,823
Other non-current liabilities	11,541	11,956
Stockholders’ equity	293,717	309,894
Total liabilities and stockholders’ equity	641,046	641,909
Guarantors
Cash and cash equivalents	1,350	495	24	903
Accounts receivable, less allowance for doubtful accounts	20,686	18,305
Receivables from affiliates	0	0
Inventories	18,174	16,357
Prepaid expenses and other current assets	1,874	2,244
Total current assets	42,084	37,401
Investment in joint venture	0	0
Goodwill	12,973	12,973
Intangible assets	0	0
Other assets	0	0
Investment in subsidiaries	0	0
Receivables from affiliates	35,145	34,637
Property, plant and equipment, net	12,472	12,855
Total assets	102,674	97,866
Accounts payable	10,467	8,274
Payables due to affiliates	0	0
Other current liabilities	598	944
Current portion of long-term debt	0	0
Total current liabilities	11,065	9,218
Long-term debt, less current portion	0	0
Payables due to affiliates	7,971	6,579
Deferred income taxes	7,111	7,061
Other non-current liabilities	0	0
Stockholders’ equity	76,527	75,008
Total liabilities and stockholders’ equity	102,674	97,866
Non-Guarantors
Cash and cash equivalents	20,465	21,659	15,906	16,598
Accounts receivable, less allowance for doubtful accounts	46,959	42,703
Receivables from affiliates	0	0
Inventories	68,080	65,472
Prepaid expenses and other current assets	6,970	5,993
Total current assets	142,474	135,827
Investment in joint venture	0	0
Goodwill	14,277	14,812
Intangible assets	15,756	16,786
Other assets	3,554	3,635
Investment in subsidiaries	0	0
Receivables from affiliates	3,513	1,465
Property, plant and equipment, net	12,932	13,027
Total assets	192,506	185,552
Accounts payable	22,305	20,070
Payables due to affiliates	751	541
Other current liabilities	8,889	7,622
Current portion of long-term debt	25	26
Total current liabilities	31,970	28,259
Long-term debt, less current portion	30	38
Payables due to affiliates	124,086	116,770
Deferred income taxes	(1,155)	(4,151)
Other non-current liabilities	186	299
Stockholders’ equity	37,389	44,337
Total liabilities and stockholders’ equity	192,506	185,552
Eliminations
Cash and cash equivalents	0	0	0	0
Accounts receivable, less allowance for doubtful accounts	0	0
Receivables from affiliates	(3,475)	(2,811)
Inventories	(68)	(68)
Prepaid expenses and other current assets	(202)	(202)
Total current assets	(3,745)	(3,081)
Investment in joint venture	0	0
Goodwill	0	0
Intangible assets	0	0
Other assets	0	0
Investment in subsidiaries	(113,646)	(119,075)
Receivables from affiliates	(132,057)	(123,349)
Property, plant and equipment, net	0	0
Total assets	(249,448)	(245,505)
Accounts payable	0	0
Payables due to affiliates	(3,475)	(2,811)
Other current liabilities	0	0
Current portion of long-term debt	0	0
Total current liabilities	(3,475)	(2,811)
Long-term debt, less current portion	0	0
Payables due to affiliates	(132,057)	(123,349)
Deferred income taxes	0	0
Other non-current liabilities	0	0
Stockholders’ equity	(113,916)	(119,345)
Total liabilities and stockholders’ equity	$ (249,448)	$ (245,505)