CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net income	$ 51,254	$ 46,178
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	19,595	18,412
Share-based compensation	4,769	4,546
Deferred income taxes	(4,760)	(3,361)
Loss on disposals of plant and equipment	127	178
Gain on equity investment	0	(4,788)
Foreign exchange (income)/expense	1,550	(103)
Changes in assets and liabilities, net of acquisitions
Receivables	(40,812)	(9,289)
Inventory	(20,614)	(31,792)
Accounts payable and accrued expenses	(1,072)	(24,712)
Income taxes	(703)	(3,481)
Income taxes-U.S. Tax Cuts and Jobs Act	(4,600)	0
Employee benefit plans	(1,718)	(2,431)
Other, net	2,153	(1,862)
Net cash flows from operating activities	5,169	(12,505)
Cash flows from investing activities:
Additions to property, plant, and equipment	(11,446)	(18,621)
Proceeds from sale of property, plant, and equipment	306	109
Cash paid for acquisitions, net of cash acquired	(8,428)	(52,255)
Other, net	199	153
Net cash flows from investing activities	(19,369)	(70,614)
Cash flows from financing activities:
Proceeds from issuance of debt	110,054	169,284
Repayment of debt	(72,721)	(122,088)
Proceeds from issuance of common stock	1,795	2,047
Purchases of common stock	(10,953)	(2,374)
Dividends paid	(10,658)	(10,199)
Payments to Noncontrolling Interests	0	(5,047)
Net cash flows from financing activities	17,517	31,623
Effect of exchange rate changes on cash	(506)	2,260
Net change in cash and equivalents	2,811	(49,236)
Cash and equivalents at beginning of period	67,233	104,331
Cash and equivalents at end of period	70,044	55,095
Cash paid for income taxes, net of refunds	15,829	14,583
Cash paid for interest	5,354	4,712
Non-cash items:
Additions to property, plant, and equipment, not yet paid	0	474
Bombas Leao S.A.
Noncash or Part Noncash Acquisitions [Line Items]
Noncash or Part Noncash Acquisition, Payables Assumed	0	24
Valley Farms Supply, Inc
Noncash or Part Noncash Acquisitions [Line Items]
Noncash or Part Noncash Acquisition, Payables Assumed	$ 450	$ 0