CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities
Net income	$ 58,184	$ 42,795	$ 27,048
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	55,114	42,743	35,231
Deferred income taxes	26,049	7,672	469
Loss from discontinued operations	268	684	394
Restructuring charges	1,004	5,183	2,956
Impairment charges (recoveries)	(29,098)	218	96
(Gains) losses on dispositions of property and other assets	1,420	(54)	(690)
Share-based compensation expense	10,969	8,038	3,848
Excess tax benefit from share-based compensation arrangements		(95)	(418)
Other non-cash items, net	5,029	6,167	5,394
Change in operating assets and liabilities (excluding the impact of acquisitions):
Receivables	(2,338)	(9,358)	(16,665)
Inventories	2,505	(2,646)	4,872
Accounts payable	7,546	1,770	(2,619)
Restructuring liabilities	(1,954)	(3,866)	(2,572)
Accrued compensation	(5,152)	(353)	1,469
Customer deposits	(10,572)	8,429	408
Income taxes payable	5,820	(4,630)	67
Other assets and liabilities, net	(12,571)	(2,379)	989
Net cash provided by operating activities	112,223	100,318	60,277
Cash flows from investing activities
Capital expenditures	(56,621)	(49,815)	(29,839)
Proceeds from insurance	31,570
Cash paid for acquired businesses, net	(1,501)	(195,989)	(430)
Proceeds from dispositions of property and other assets	947	1,166	1,542
Net cash used in investing activities	(25,605)	(244,638)	(28,727)
Cash flows from financing activities
Proceeds from borrowings	90,004	229,701	50,000
Payments on debt and capital lease obligations	(135,801)	(108,915)	(62,969)
Dividends paid on common stock	(8,160)	(8,111)	(8,036)
Debt issuance costs	(5)	(336)
Common stock purchased for treasury	(2,119)	(722)	(4,816)
Excess tax benefit from share-based compensation arrangements		95	418
Acquisition of business - deferred consideration		(130)	(896)
Proceeds from exercise of stock options			1,041
Net cash provided by (used in) financing activities	(56,081)	111,582	(25,258)
Effect of exchange rate changes on cash and cash equivalents	2,286	(2,893)	(6,751)
Net change in cash and cash equivalents	32,823	(35,631)	(459)
Cash and cash equivalents, beginning of year	20,900	56,531	56,990
Cash and cash equivalents, end of period	$ 53,723	$ 20,900	$ 56,531