Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities:
Net income	$ 86,920	$ 121,310	$ 64,860
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of property, plant and equipment and amortization of intangible assets	96,713	98,156	98,356
Amortization of debt issuance costs	2,082	2,220	4,171
Share-based incentive compensation	9,438	13,919	8,835
Deferred tax (benefit)/provision	15,826	(3,634)	(7,667)
Foreign currency transactions	1,052	2,782	(14,402)
Other operating non-cash items	1,813	1,165	15,163
Changes in operating assets and liabilities, net of effects of businesses acquired:
(Increase)/decrease in trade receivables	45,412	(39,680)	(15,885)
(Increase)/decrease in inventories	16,413	(31,406)	(25,632)
Increase/(decrease) in trade payables	(12,036)	5,444	17,545
Increase/(decrease) in provisions	(10,375)	(4,427)	(12,317)
Increase/(decrease) in tax liabilities	(7,254)	4,843	(11,954)
Increase/(decrease) in other assets and liabilities that cannot be allocated to investing or financing activities	(14,497)	(48,707)	26,666
Net cash provided by operating activities	231,507	121,985	147,739
Cash flows from investing activities:
Cash paid for the acquisition of intangible assets and property, plant and equipment	(155,848)	(116,157)	(90,282)
Acquisition of businesses, net of cash and cash equivalents acquired	0	(36,571)	0
Cash received from the disposal of intangible assets and property, plant and equipment	0	64,672	0
Net cash used in investing activities	(155,848)	(88,056)	(90,282)
Cash flows from financing activities:
Proceeds from borrowings	0	0	11,890
Payments for debt issue costs	(1,721)	(741)	(5,327)
Repayments of long-term debt	(8,036)	(8,288)	(28,866)
Cash inflows related to current financial liabilities	96,956	48,963	11,652
Cash outflows related to current financial liabilities	(101,303)	(26,370)	(12,141)
Dividends paid to shareholders	(48,033)	(47,665)	(45,705)
Repurchase of common stock	0	(4,926)	0
Taxes paid for shares issued under net settlement feature	(6,475)	(4,741)	0
Net cash used in financing activities	(68,612)	(43,768)	(68,497)
Increase (decrease) in cash, cash equivalents and restricted cash	7,047	(9,839)	(11,040)
Cash, cash equivalents and restricted cash at the beginning of the period	61,604	75,213	80,480
Effect of exchange rate changes on cash	(420)	(3,770)	5,773
Cash, cash equivalents and restricted cash at the end of the period	68,231	61,604	75,213
Less restricted cash at the end of the period	4,505	4,588	2,929
Cash and cash equivalents at the end of the period	63,726	57,016	72,284
Cash paid for interest, net	(20,399)	(24,367)	(25,905)
Cash paid for income taxes	(24,106)	(60,228)	(39,549)
Supplemental disclosure of non-cash activity:
Liabilities under build-to-suit lease	0	$ 28,657	$ 0
Liabilities for leasing - current	6,254
Liabilities for leasing - non-current	$ 26,280