CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
OPERATING ACTIVITIES
Net income	$ 29,408	$ 7,899
Adjustments to reconcile net income to net cash provided by/(used in) operating activities:
Depreciation	15,642	18,302
Amortization	2,314	2,646
Change in deferred taxes and other liabilities	(1,065)	(2,028)
Provision for write-off of property, plant and equipment	386	271
Non-cash interest expense	151
Compensation and benefits paid or payable in Class A Common Stock	(547)	289
Fair value adjustment on foreign currency option		37
Changes in operating assets and liabilities that (used)/provided cash:
Accounts receivable	(11,624)	(25,089)
Contract assets	(481)	2,116
Inventories	(16,662)	(11,753)
Prepaid expenses and other current assets	(2,804)	(4,063)
Income taxes prepaid and receivable	674	102
Accounts payable	21,750	(2,538)
Accrued liabilities	(11,095)	(1,227)
Income taxes payable	1,506	(3,431)
Noncurrent receivables	(294)	(2,527)
Other noncurrent liabilities	(1,679)	(377)
Other, net	(1,014)	2,424
Net cash provided by/(used in) operating activities	24,566	(18,947)
INVESTING ACTIVITIES
Purchases of property, plant and equipment	(20,798)	(15,771)
Purchased software	(22)	(29)
Net cash used in investing activities	(20,820)	(15,800)
FINANCING ACTIVITIES
Proceeds from borrowings	20,000	13,011
Principal payments on debt	(28,004)	(8,490)
Principal payments on finance lease liabilities	(400)
Taxes paid in lieu of share issuance	(971)	(1,652)
Proceeds from options exercised	44	147
Dividends paid	(5,808)	(5,474)
Net cash used in financing activities	(15,139)	(2,458)
Effect of exchange rate changes on cash and cash equivalents	1,023	4,904
Decrease in cash and cash equivalents	(10,370)	(32,301)
Cash and cash equivalents at beginning of period	197,755	183,727
Cash and cash equivalents at end of period	$ 187,385	$ 151,426