Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Operating activities:
Net income	$ 7,257	$ 1,617	$ 6,539
Reconciliation of net income to cash provided by operating activities:
Depreciation and amortization	12,521	13,112	13,823
Provision (benefit) for deferred income taxes	(2,536)	(895)	1,243
Equity compensation expense	689	392	360
Provision for doubtful accounts	504	304	724
Loss on sale of property, plant, and equipment	58	27	30
Changes in operating assets and liabilities:
Accounts receivable	(2,263)	3,159	734
Inventories	76	775	567
Prepaid expenses and other current assets	(1,302)	(982)	109
Accounts payable and accrued expenses	3,826	2,840	(308)
Other	55	42	115
Net cash provided by operating activities	18,885	20,391	23,936
Investing activities:
Purchases of property, plant, and equipment, net	(11,193)	(8,715)	(2,997)
Other investing activities	0	102	115
Net cash used in investing activities	(11,193)	(8,613)	(2,882)
Financing activities:
Proceeds from issuance of partnership common units, net of underwriters' discount	50,234	0	0
Payment of offering costs	(8,057)	0	0
Payment of affiliate note payable	(32,200)	0	0
Distributions paid	(6,816)	0	0
Payment of financing costs	(362)	0	0
Net distribution (to) from parent	408	(9,735)	(17,854)
Net cash provided by (used in) financing activities	3,207	(9,735)	(17,854)
Effect of exchange rate changes on cash	(52)	8	402
Increase in cash and cash equivalents	10,847	2,051	3,602
Cash and cash equivalents at beginning of period	6,629	4,578	976
Cash and cash equivalents at end of period	$ 17,476	$ 6,629	$ 4,578