CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Operating Activities:
Net income	$ 20,305	$ 27,197
Adjustments to reconcile net income to cash from operating activities:
Depreciation and amortization	18,312	16,504
Stock-based compensation expense	5,740	5,025
Deferred income taxes	8,825	(332)
Equity in undistributed income of unconsolidated joint ventures	(1,321)	(1,311)
Dividends received from unconsolidated joint ventures	426	780
Pension and postretirement benefits	(1,404)	(589)
Loss (gain) from the sale of property, plant and equipment	15	(1)
Changes in operating assets and liabilities, excluding effects of acquisitions:
Accounts receivable	(8,693)	2,309
Inventories	616	(10,624)
Pension contribution	(138)	(6,500)
Other current assets	(2,056)	(2,580)
Accounts payable and other accrued expenses	12,585	(10,417)
Other, net	(1,908)	2,952
Net cash provided by operating activities	51,304	22,413
Investing Activities:
Business acquisition, net of cash acquired	0	(155,778)
Capital expenditures	(9,992)	(14,274)
Proceeds from the sale of property, plant and equipment, net	0	1
Net cash used in investing activities	(9,992)	(170,051)
Financing Activities:
Proceeds from long term borrowings		125,000
Repayment of debt principal and long term lease obligation	(1,516)	(5,131)
Repurchases of capital stock	(3,997)	0
Proceeds from the exercise of stock options, net	2,058	6,515
Issuance of restricted stock shares	(1,201)	(2,342)
Proceeds from issuance of shares to employee stock purchase plan	427	345
Net cash (used in) provided by financing activities	(4,229)	124,387
Effect of exchange rate fluctuations on cash	5,728	(4,362)
Net increase (decrease) in cash and cash equivalents	42,811	(27,613)
Cash and cash equivalents at beginning of period	204,586	237,375
Cash and cash equivalents at end of period	$ 247,397	$ 209,762