Consolidated Statement of Cash Flows Statement - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash Flows from Operating Activities:
Net income (loss)	$ 30,960	$ (39,800)	$ (33,400)
Loss from discontinued operations	0	0	(4,740)
Income (loss) from continuing operations	30,960	(39,800)	(28,660)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Impairment of goodwill and indefinite-lived intangible assets	0	98,900	75,680
Loss on dispositions of assets	1,080	1,870	2,330
Depreciation	26,950	24,390	22,570
Amortization of intangible assets	19,920	20,470	20,970
Amortization of debt issue costs	1,320	1,370	1,710
Deferred income taxes	15,260	(32,160)	(8,750)
Non-cash compensation expense	6,780	6,940	6,340
Tax effect from stock based compensation	0	(640)	(590)
Debt financing and related expenses	6,640	0	1,970
Decrease in receivables	1,220	7,990	5,300
Decrease in inventories	4,350	5,180	3,250
(Increase) decrease in prepaid expenses and other assets	(310)	2,550	4,730
Increase (decrease) in accounts payable and accrued liabilities	3,640	(18,120)	(29,530)
Other operating activities	2,250	1,530	(750)
Net cash provided by operating activities of continuing operations	120,060	80,470	76,570
Net cash used for operating activities of discontinued operations	0	0	(14,030)
Net cash provided by operating activities	120,060	80,470	62,540
Cash Flows from Investing Activities:
Capital expenditures	(36,800)	(31,330)	(28,660)
Acquisition of businesses, net of cash acquired	0	0	(10,000)
Net proceeds from dispositions of property and equipment	4,450	220	1,700
Net cash used for investing activities of continuing operations	(32,350)	(31,110)	(36,960)
Net cash used for investing activities of discontinued operations	0	0	(2,510)
Net cash used for investing activities	(32,350)	(31,110)	(39,470)
Cash Flows from Financing Activities:
Proceeds from issuance of senior notes	300,000	0	0
Proceeds from borrowings on term loan facilities	0	0	275,000
Repayments of borrowings on term loan facilities	(257,940)	(13,850)	(444,890)
Proceeds from borrowings on revolving credit and accounts receivable facilities	401,300	402,420	1,129,840
Repayments of borrowings on revolving credit and accounts receivable facilities	(517,310)	(433,350)	(1,169,370)
Payments for deferred purchase price	0	(2,530)	(6,440)
Debt financing fees	(6,070)	0	(1,850)
Shares surrendered upon options and restricted stock vesting to cover taxes	(510)	(1,590)	(2,770)
Cash transferred to the Cequent businesses	0	0	(17,050)
Other financing activities	(310)	800	1,090
Net cash used for financing activities of continuing operations	(80,840)	(48,100)	(236,440)
Net cash provided by financing activities of discontinued operations	0	0	208,400
Net cash used for financing activities	(80,840)	(48,100)	(28,040)
Increase (decrease) for the year	6,870	1,260	(4,970)
At beginning of year	20,710	19,450	24,420
At end of year	27,580	20,710	19,450
Supplemental disclosure of cash flow information:
Cash paid for interest	9,430	11,800	15,170
Cash paid for income taxes	$ 16,230	$ 17,210	$ 30,580