Condensed Consolidated Statements of Cash Flows - Unaudited - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net earnings	$ 11,548	$ 8,484
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	5,483	4,708
Pension and Other Postretirement Expense (Income)	107	(417)
Stock-based compensation	923	880
Deferred income taxes	1,289	2,313
Gain (Loss) on Disposition of Assets	(1)	(2)
Gain on foreign currency hedges, net of cash	(56)	0
Changes in assets and liabilities:
Accounts receivable	1,435	7
Inventories	(788)	(2,076)
Other assets	147	(16)
Accounts payable	2,855	942
Accrued payroll and benefits	(3,596)	(5,169)
Accrued expenses	(69)	(2,280)
Income taxes payable	1,179	248
Other liabilities	(224)	2,232
Pension and other post-retirement plans	(80)	(79)
Net cash provided by operating activities	20,154	9,779
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(6,912)	(3,806)
Proceeds from sale of assets	0	1
Net cash used in investing activities	(6,912)	(3,805)
CASH FLOWS FROM FINANCING ACTIVITIES:
Payments of long-term debt	(334,100)	(373,000)
Proceeds from borrowings of long-term debt	331,800	377,900
Dividends paid	(1,318)	(1,310)
Net cash (used in) provided by financing activities	(5,041)	2,024
Payments Related to Tax Withholding for Share-based Compensation	(1,423)	(1,566)
Effect of exchange rate changes on cash and cash equivalents	(390)	16
Net increase in cash and cash equivalents	7,811	8,014
Cash and cash equivalents at beginning of period	113,572	113,805
Cash and cash equivalents at end of period	121,383	121,819
Supplemental cash flow information:
Cash paid for interest	486	529
Cash paid for income taxes, net	$ 809	$ 1,386