Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating activities:
Net income	$ 166,186	$ 59,415	$ 135,601
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	94,238	90,150	80,154
Loss (gain) on disposition of property, plant and equipment	71	(246)	(349)
Stock compensation expense	12,158	12,279	11,493
Effect of U.S. Tax Reform on deferred tax assets	0	4,152	0
Changes in assets and liabilities, net of the effects of acquisitions:
Accounts receivable	(10,960)	(50,082)	(23,057)
Inventories	(12,369)	(173)	1,989
Prepaid expenses and other current assets	(2,890)	(4,241)	569
Accounts payable	12,489	12,018	11,778
Accrued liabilities	(580)	14,439	15,825
Deferred income taxes	(18,876)	3,589	(2,210)
Long-term retirement benefits	1,632	(16,349)	(15,492)
Long-term tax liability	(6,809)	79,770	0
Other	2,909	(801)	1,345
Net cash provided by operating activities	237,199	203,920	217,646
Investing activities:
Proceeds from disposition of property, plant and equipment	1,374	2,594	780
Capital expenditures	(57,273)	(58,712)	(47,577)
Business acquisitions, net of cash acquired	(430,487)	(8,922)	(128,613)
Component Repair Program payments	0	0	(4,100)
Revenue Sharing Program payments	(5,800)	0	0
Other	(1,000)	(3,000)	0
Net cash used in investing activities	(493,186)	(68,040)	(179,510)
Financing activities:
Net change in other borrowings	(5,145)	(25,304)	8,375
Payments on long-term debt	(433,904)	(73,161)	(321,506)
Proceeds from the issuance of long-term debt	841,036	129,118	303,277
Proceeds from the issuance of common stock	1,131	2,408	4,611
Common stock repurchases	(138,275)	(40,791)	(20,520)
Dividends paid	(32,206)	(29,551)	(27,435)
Withholding taxes paid on stock issuances	(5,395)	(5,380)	(4,885)
Other	(11,678)	(21,090)	4,771
Net cash provided (used) by financing activities	215,564	(63,751)	(53,312)
Effect of exchange rate changes on cash flows	(4,148)	6,714	(2,303)
(Decrease) increase in cash and cash equivalents	(44,571)	78,843	(17,479)
Cash and cash equivalents at beginning of year	145,290	66,447	83,926
Cash and cash equivalents at end of year	$ 100,719	$ 145,290	$ 66,447