CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net income	$ 22,537	$ 19,577
Adjustments to reconcile net income to net cash provided (used) by operating activities:
Depreciation	30,204	31,418
Amortization	3,045	1,934
Deferred income tax expense	595	4,635
Equity income of unconsolidated entities, net	(20)	0
Other, net	(279)	1,944
Changes in assets and liabilities:
Accounts receivable	(3,270)	(4,848)
Inventories	(14,448)	(11,490)
Contract assets	6,770	(5,698)
Right-of-use assets	3,895
Accounts payable	3,099	7,340
Accrued compensation	(19,924)	(26,131)
Advances on contracts	(3,406)	(7,348)
Operating lease liabilities	(3,913)
Retirement plan liabilities, net	(9,403)	(12,252)
Other assets and liabilities	(644)	(7,324)
Net cash provided (used) by operating activities	14,838	(8,243)
Cash flows from investing activities:
Purchases of property, plant and equipment	(36,407)	(26,897)
Purchase of business, net of cash acquired	680	0
Proceeds from sales of assets	1,177	377
Net payments from settlement of foreign currency forward exchange contracts	(4,091)	(3,822)
Net cash used by investing activities	(38,641)	(30,342)
Cash flows from financing activities:
Short-term borrowings, net	(3,578)	(3,659)
Current maturities and long-term debt:
Additions	56,998	46,000
Reductions	(1,700)	(2,944)
Sale of noncontrolling interests	876	477
Stock-based compensation - Employee taxes paid	(8,237)	(709)
Net cash provided by financing activities	44,359	39,165
Effect of exchange rate changes on cash and cash equivalents, including restricted cash	(17)	738
Net increase in cash and cash equivalents, including restricted cash	20,539	1,318
Cash and cash equivalents, including restricted cash, at beginning of period	67,146	66,209
Cash and cash equivalents, including restricted cash, at end of period	$ 87,685	$ 67,527