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	$ 66,413	$ 55,786
Non-cash items included in net income from continuing operations:
Depreciation and amortization	14,061	13,976
Income of investees, net of dividends	(2,299)	1,779
Gains on asset disposals and impairments, net	(8)	0
Recognition of losses for pension and postretirement plans	505	446
Stock-based compensation expense	4,461	3,412
Changes in assets and liabilities:
Accounts receivable	16,943	(41,153)
Accounts payable	10,528	(14,003)
Contracts in progress and advance billings on contracts	(74,153)	(4,890)
Income taxes	(5,502)	(2,607)
Accrued and other current liabilities	364	(29,810)
Pension liability, accrued postretirement benefit obligation and employee benefits	(48,929)	(38,891)
Other, net	(989)	1,279
NET CASH USED IN OPERATING ACTIVITIES	(18,605)	(54,676)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(17,634)	(13,713)
Purchases of securities	(1,033)	(3,503)
Sales and maturities of securities	2,948	3,317
Investments, net of return of capital, in equity method investees	0	(1,701)
Proceeds from asset disposals	8	0
Other, net	0	691
NET CASH USED IN INVESTING ACTIVITIES	(15,711)	(14,909)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings under the Credit Agreement	0	73,600
Repayments under Credit Agreement	(6,951)	(30,476)
Dividends paid to common shareholders	(15,947)	(8,985)
Exercise of stock options	2,525	9,665
Cash paid for shares withheld to satisfy employee taxes	(4,657)	(4,973)
Other	(226)	(146)
NET CASH (USED IN) PROVIDED BY FINANCING ACTIVITIES	(25,256)	38,685
EFFECTS OF EXCHANGE RATE CHANGES ON CASH	(2,236)	1,013
TOTAL DECREASE IN CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AND CASH EQUIVALENTS	(61,808)	(29,887)
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	213,144	134,600
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH AND CASH EQUIVALENTS AT END OF PERIOD	151,336	104,713
Cash paid during the period for:
Interest	3,463	3,330
Income taxes (net of refunds)	24,370	27,082
SCHEDULE OF NON-CASH INVESTING ACTIVITY:
Accrued capital expenditures included in accounts payable	$ 4,735	$ 3,016

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Amount of gain (loss) on disposition of assets and impairments.

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Amount of increase (decrease) in the asset reflecting the cost incurred on uncompleted contracts in excess of related billings and the liability reflecting cash payments received before the related costs have been incurred.

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The increase (decrease) during the reporting period in the amount due to fund pension and non-pension benefits to employees, retired and disabled former employees, as well as the increase (decrease) during the period of accrued employee benefits.

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Recognition of gains losses for pension and postretirement plans.

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Future cash outflow to pay for purchases of fixed assets that have occurred.

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Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount of increase (decrease) in cash, cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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Amount of increase (decrease) from the effect of exchange rate changes on cash and cash equivalent balances held in foreign currencies.

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This element represents the undistributed income (or loss) of equity method investments, net of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporations; such investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities.

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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The increase (decrease) during the reporting period in the amount due from customers for the credit sale of goods and services; includes accounts receivable and other types of receivables.

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The increase (decrease) during the reporting period in the aggregate amount of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business.

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The increase (decrease) during the reporting period in the amounts payable to taxing authorities for taxes that are based on the reporting entity's earnings, net of amounts receivable from taxing authorities for refunds of overpayments or recoveries of income taxes, and in deferred and other tax liabilities and assets.

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The increase (decrease) during the reporting period in other expenses incurred but not yet paid.

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Amount of increase (decrease) in operating assets after deduction of operating liabilities classified as other.

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Amount of cash paid, after deduction of cash paid for capitalized interest, for interest. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.

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Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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No definition available.

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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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Amount of cash (inflow) outflow from investing activities classified as other.

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

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Aggregate cash payments for a combination of transactions that are classified as investing activities in which assets, which may include securities, other types of investments, or productive assets, are purchased from third-party sellers. This element can be used by entities to aggregate payments for all asset purchases that are classified as investing activities.

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The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

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No definition available.

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Amount of cash inflow (outflow) from financing activities classified as other.

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The cash inflow associated with the sale or maturity (principal being due) of securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

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Aggregate cash proceeds received from a combination of transactions that are classified as investing activities in which assets, which may include one or more investments, are sold to third-party buyers. This element can be used by entities to aggregate proceeds from all asset sales that are classified as investing activities.

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No definition available.

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Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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