Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:
Net (loss) income	$ (44,445)	$ 25,656	$ 29,290
Adjustments to reconcile net (loss) income to cash provided by operating activities:
Deferred income taxes	(14,582)	(2,914)	3,244
Depreciation	14,429	7,882	6,890
Amortization	12,245	4,695	3,112
Impairment of goodwill	80,337	0	0
Equity loss (income) and remeasurement gain	(167)	(1,282)	(1,316)
(Gain) loss on sales and disposals of property, plant, and equipment	(2,064)	21	127
Share-based compensation	1,471	3,007	2,156
Excess income tax benefit from share-based compensation	(253)	(336)	(203)
Change in operating assets and liabilities, net of acquisitions:
Accounts receivable	31,223	15,311	(36,782)
Inventories	4,331	(9,872)	29,919
Other current assets	3,248	(1,004)	(310)
Prepaid income tax	1,134	2,530	(6,882)
Other noncurrent assets	(909)	(386)	264
Dividends from LB Pipe & Coupling Products, LLC	90	630	558
Accounts payable	(17,204)	16,285	(5,206)
Deferred revenue	(2,279)	591	(1,805)
Accrued payroll and employee benefits	(5,136)	2,542	(608)
Other current liabilities	(4,189)	2,732	(7,561)
Other liabilities	(1,108)	651	(732)
Net cash provided by operating activities	56,172	66,739	14,155
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds from the sale of property, plant, and equipment	5,339	184	0
Capital expenditures on property, plant and equipment	(14,913)	(17,056)	(9,674)
Acquisitions, net of cash acquired	(196,001)	(80,797)	(37,500)
Capital contributions to equity method investments	0	(82)	0
Net cash used by investing activities	(205,575)	(97,751)	(47,174)
CASH FLOWS FROM FINANCING ACTIVITIES:
Repayments of debt	(161,068)	(125)	(6)
Proceeds from debt	301,063	24,516	0
Proceeds from exercise of stock options and stock awards	68	131	35
Financing fees	(1,670)	(473)	0
Treasury stock acquisitions	2,701	985	708
Cash dividends on common stock paid to shareholders	(1,656)	(1,345)	(1,240)
Excess income tax benefit from share-based compensation	253	336	203
Net cash provided (used) by financing activities	134,289	22,055	(1,716)
Effect of exchange rate changes on cash and cash equivalents	(3,598)	(3,642)	(2,106)
Net decrease in cash and cash equivalents	(18,712)	(12,599)	(36,841)
Cash and cash equivalents at beginning of period	52,024	64,623	101,464
Cash and cash equivalents at end of period	33,312	52,024	64,623
Supplemental Disclosure of Cash Flow Information:
Interest paid	3,674	362	330
Income taxes paid	7,835	14,617	18,697
Capital expenditures funded through financing agreements	$ 288	$ 1,981	$ 0