CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net income	$ 19,577	$ 10,137
Adjustments to reconcile net income to net cash used by operating activities:
Depreciation	31,418	30,207
Amortization	1,934	2,021
Deferred income tax expense (benefit)	4,635	(221)
Dividends from unconsolidated entities	0	19
Other, net	1,944	5,131
Changes in assets and liabilities:
Accounts receivable	(4,848)	(27,882)
Inventories	(11,490)	(755)
Contract assets	(5,698)	0
Accounts payable	7,340	(541)
Accrued interest payable	51	286
Accrued compensation	(26,131)	(12,352)
Advances on contracts	(7,348)	(4,998)
Retirement plan liabilities, net	(12,252)	(8,381)
Other assets and liabilities	(7,375)	1,205
Net cash used by operating activities	(8,243)	(6,124)
Cash flows from investing activities:
Purchases of property, plant and equipment	(26,897)	(16,989)
Proceeds from sales of assets	377	1,006
Net proceeds (payments) from settlement of foreign currency forward exchange contracts	3,822	(33)
Net cash used by investing activities	(30,342)	(15,950)
Cash flows from financing activities:
Short-term borrowings, net	(3,659)	3,655
Current maturities and long-term debt:
Additions	46,000	24,000
Reductions	(2,944)	(14,345)
Sale of noncontrolling interests	477	0
Stock-based compensation - Employee taxes paid	(709)	(53)
Deferred financing costs	0	(36)
Net cash provided by financing activities	39,165	13,221
Effect of exchange rate changes on cash and cash equivalents, including restricted cash	738	1,403
Net increase (decrease) in cash and cash equivalents, including restricted cash	1,318	(7,450)
Cash and cash equivalents, including restricted cash, at beginning of period	66,209	71,879
Cash and cash equivalents, including restricted cash, at end of period	$ 67,527	$ 64,429