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:
Net income	$ 67,600	$ 55,900	$ 30,800
Loss from discontinued operations, net of income taxes	400	100	0
Income from continuing operations	68,000	56,000	30,800
Adjustments to reconcile net income from continuing operations to cash provided by operating activities of continuing operations:
Depreciation	25,400	20,000	19,100
Amortization	13,100	9,600	6,200
Stock-based compensation	9,900	7,200	7,300
Pension and other post-retirement benefits expense	(1,000)	(1,400)	2,700
Deferred income taxes	(100)	5,800	4,900
Other	(700)	100	(900)
Changes in operating assets and liabilities, net of effects of acquisitions:
Trade receivables, net	(29,000)	(11,300)	9,800
Inventories	(2,900)	15,600	7,700
Accounts payable, trade and other	16,100	10,400	2,100
Advance payments and progress billings	(17,000)	26,900	1,400
Accrued pension and other post-retirement benefits, net	(10,500)	(14,300)	(19,900)
Other assets and liabilities, net	(3,400)	(12,400)	6,800
Cash provided by continuing operating activities	67,900	112,200	78,000
Net cash required by discontinued operating activities	(500)	(300)	(300)
Cash provided by operating activities	67,400	111,900	77,700
Cash Flows From Investing Activities:
Acquisitions, net of cash acquired	(232,000)	(150,900)	(91,300)
Capital expenditures	(37,100)	(37,700)	(36,700)
Proceeds from disposal of assets	2,300	1,500	1,400
Proceeds from property available for sale	0	2,000	0
Cash required by investing activities	(266,800)	(185,100)	(126,600)
Cash Flows From Financing Activities:
Net increase (decrease) in short-term debt	900	(1,500)	1,500
Proceeds from Short-term Debt	15,300	0	0
Repayments of Short-term Debt	(11,000)	0	0
Cash provided by refinancing credit facility	0	183,700	0
Cash payments to settle existing credit facility	0	(183,700)	0
Net borrowings (payments) on credit facilities	62,400	184,300	77,500
Issuance of long-term debt	149,500	0	4,500
Cash payments to settle private placement debt	0	(75,000)	0
Repayment of long-term debt	(2,000)	(1,400)	(5,600)
Excess tax benefits	1,500	2,200	1,000
Tax witholdings on stock-based compensation awards	(2,600)	(5,800)	(3,600)
Purchase of treasury stock	(4,300)	(7,700)	(2,800)
Dividends	(11,800)	(11,200)	(10,700)
Other	(3,000)	0	100
Cash provided by financing activities	194,900	83,900	61,900
Effect of foreign exchange rate changes on cash and cash equivalents	500	(6,800)	(9,100)
Increase (decrease) in cash and cash equivalents	(4,000)	3,900	3,900
Cash and cash equivalents, beginning of period	37,200	33,300	29,400
Cash and cash equivalents, end of period	33,200	37,200	33,300
Supplemental Cash Flow Information:
Interest paid	10,400	7,700	7,700
Income taxes paid	25,800	13,800	8,200
Consideration, due to seller	$ 0	$ 0	$ 0