Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash flows from operating activities:
Earnings from continuing operations	$ 58,854	$ 60,438	$ 65,780
Adjustments to reconcile earnings from continuing operations to net cash provided by (used in) operating activities of continuing operations:
Depreciation and amortization	44,929	37,729	36,209
Accretion of convertible notes discount	2,144	2,035	1,931
Provision for doubtful accounts	2,635	1,694	853
Net loss (gain) on sale of assets	11	(328)	233
Gain (Loss) on Derivative Instruments, Net, Pretax	1,007	579	1,071
Stock compensation expense	5,686	6,388	5,411
Excess tax (expense) benefit from share-based compensation arrangements	0	(327)	(834)
Deferred income taxes	7,928	(1,281)	1,434
Changes in assets and liabilities, excluding effects of acquisitions/divestitures:
Accounts receivable	(778)	4,556	(23,876)
Inventories	(11,891)	(2,928)	30,181
Income tax refunds receivable	(2,474)	(3,463)	2,292
Other current assets	4,859	(2,823)	(2,560)
Accounts payable - trade	693	4,697	(3,858)
Accrued contract losses	745	2	(1,899)
Advances on contracts	2,082	8,868	(7,065)
Other current liabilities	1,049	(1,144)	6,746
Income taxes payable	351	(2,403)	4,455
Pension liabilities	(9,087)	(2,300)	(6,380)
Other long-term liabilities	(1,036)	(405)	(1,035)
Net cash provided by operating activities of continuing operations	107,707	109,584	109,089
Net cash used in operating activities of discontinued operations	0	0	(2,902)
Net cash provided by operating activities	107,707	109,584	106,187
Cash flows from investing activities:
Proceeds from sale of assets	201	719	39
Proceeds from sale of discontinued operations	0	0	7,863
Expenditures for property, plant & equipment	(29,777)	(29,932)	(28,283)
Acquisition of businesses including earn out adjustments, net of cash acquired	(6,631)	(201,252)	(77,618)
Other, net	(1,376)	(2,143)	(2,060)
Cash used in investing activities of continuing operations	(37,583)	(232,608)	(100,059)
Cash provided by investing activities of discontinued operations	0	0	3
Cash used in investing activities	(37,583)	(232,608)	(100,056)
Cash flows from financing activities:
Net borrowings (repayments) under revolving credit agreements	(15,147)	143,025	15,788
Borrowings under Term Loan Facility	0	100,000	0
Debt repayment	(5,000)	(83,750)	(10,000)
Bank overdraft	275	(3,462)	1,568
Proceeds from exercise of employee stock awards	9,533	4,856	6,411
Purchase of treasury shares	(13,792)	(12,836)	(853)
Dividends paid	(19,510)	(19,026)	(17,286)
Debt issuance costs	0	(1,348)	0
Windfall tax (expense) benefit	0	327	834
Other	(318)	(198)	0
Cash provided by (used in) financing activities of continuing operations	(43,959)	127,588	(3,538)
Cash provided by (used in) financing activities of discontinued operations	0	0	0
Cash provided by (used in) financing activities	(43,959)	127,588	(3,538)
Net increase in cash and cash equivalents	26,165	4,564	2,593
Effect of exchange rate changes on cash and cash equivalents	(1,422)	(513)	(566)
Cash and cash equivalents at beginning of period	16,462	12,411
Cash and cash equivalents at end of period	$ 41,205	$ 16,462	$ 12,411