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 earnings	$ 34,380	$ 6,954	$ 26,522
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	18,992	16,254	16,971
Stock-based compensation	2,738	3,195	2,660
Restructuring, impairment, and restructuring-related charges	3,048	6,915	5,941
Restructuring loss on pension settlement	0	8,280	0
Pension and other post-retirement plan income	(1,599)	(2,451)	(2,290)
Non-recurring environmental expense	0	14,541	0
Deferred income taxes	10,297	(8,920)	4,900
Gain (Loss) on Disposition of Property Plant Equipment	11,450	2,156	1,915
Gain (Loss) on Foreign Currency Derivatives Recorded in Earnings, Net	(36)	0	0
Changes in assets and liabilities, net of acquisitions and divestitures:
Accounts receivable	(7,120)	1,036	4,356
Inventories	(2,290)	2,225	3,437
Other assets	(289)	4,090	(5,672)
Accounts payable	537	(5,126)	(2,692)
Accrued Salaries and Benefits	1,876	(3,012)	(8,124)
Accrued expenses	(2,597)	(5,731)	(9,872)
Income taxes payable	966	5,264	262
Other liabilities	(52)	2,502	721
Pension and other post-retirement plans	(303)	295	(414)
Total adjustments	12,822	32,197	6,827
Net cash provided by operating activities	47,202	39,151	33,349
Cash flows from investing activities:
Capital expenditures	(20,500)	(9,723)	(12,949)
Proceeds from sale of assets	12,296	1,878	4,951
Payment for acquisitions, net of cash acquired	(73,063)	(1,285)	0
Net cash used in investing activities	(81,267)	(9,130)	(7,998)
Cash flows from financing activities:
Payments of long-term debt	(2,458,400)	(1,343,500)	(1,030,200)
Proceeds from borrowings of long-term debt	2,456,800	1,359,200	1,030,200
Payments of short-term notes payable	0	(164)	(810)
Proceeds from borrowings of short-term notes payable	0	164	810
Purchase of treasury stock	0	(18,088)	(8,002)
Dividends paid	(5,234)	(5,291)	(5,374)
Exercise of stock options	0	64	1,204
Excess tax benefit on equity-based compensation	0	313	297
Payments Related to Tax Withholding for Share-based Compensation	(1,809)	(527)	(926)
Other	0	0	(3,132)
Net cash used in financing activities	(8,643)	(7,829)	(15,933)
Effect of exchange rate on cash and cash equivalents	(415)	228	722
Net (decrease) increase in cash and cash equivalents	(43,123)	22,420	10,140
Cash and cash equivalents at beginning of year	156,928	134,508	124,368
Cash and cash equivalents at end of year	113,805	156,928	134,508
Supplemental cash flow information:
Cash paid for interest	2,939	2,415	2,113
Cash paid for income taxes, net	10,471	6,779	7,994
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Notes Issued	$ 1,006	$ 0	$ 0