CONSOLIDATED STATEMENTS OF CASH FLOW - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
OPERATING ACTIVITIES
Net income	$ 10,974	$ 13,316
Adjustments to reconcile net income to net cash (used in)/provided by operating activities:
Depreciation	14,644	13,124
Amortization	2,649	1,696
Change in other noncurrent liabilities	(1,596)	(1,364)
Change in deferred taxes and other liabilities	(612)	2,529
Provision for write-off of property, plant and equipment	296	592
Non-cash interest expense	211
Compensation and benefits paid or payable in Class A Common Stock	989	864
Changes in operating assets and liabilities that provide/(use) cash:
Accounts receivable	(741)	(902)
Inventories	(14,921)	(1,348)
Prepaid expenses and other current assets	(1,917)	(5,382)
Income taxes prepaid and receivable		(1,895)
Accounts payable	3,524	1,632
Accrued liabilities	(10,971)	(8,843)
Income taxes payable	(2,486)	(3,836)
Contract receivables	(3,915)
Other, net	(700)	(4,801)
Net cash (used in)/provided by operating activities	(4,572)	5,382
INVESTING ACTIVITIES
Purchases of property, plant and equipment	(25,045)	(7,993)
Purchased software	(38)	(82)
Net cash used in investing activities	(25,083)	(8,075)
FINANCING ACTIVITIES
Proceeds from borrowings	16,145	12,396
Principal payments on debt	(20,602)	(22,398)
Debt acquisition costs		(200)
Taxes paid in lieu of share issuance	(1,364)	(1,272)
Proceeds from options exercised	75	205
Dividends paid	(5,459)	(5,443)
Net cash used in financing activities	(11,205)	(16,712)
Effect of exchange rate changes on cash and cash equivalents	2,451	3,907
Decrease in cash and cash equivalents	(38,409)	(15,498)
Cash and cash equivalents at beginning of period	181,742	185,113
Cash and cash equivalents at end of period	$ 143,333	$ 169,615