Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock	Acummulated Other Comprehensive Income
Balance (in shares) at Sep. 30, 2017		12,234			(806)
Balance at Sep. 30, 2017	$ 321,296	$ 122	$ 54,329	$ 310,598	$ (24,999)	$ (18,754)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(5,662)			(5,662)
Foreign currency translation adjustments	(314)					(314)
Stock-based compensation (in shares)		23
Stock-based compensation	1,069		1,069
Shares withheld in lieu of employee tax withholding	(438)		(438)
Dividends paid	(2,977)			(2,977)
Balance (in shares) at Dec. 31, 2017		12,257			(806)
Balance at Dec. 31, 2017	312,974	$ 122	54,960	301,959	$ (24,999)	(19,068)
Balance (in shares) at Sep. 30, 2017		12,234			(806)
Balance at Sep. 30, 2017	321,296	$ 122	54,329	310,598	$ (24,999)	(18,754)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(8,691)
Foreign currency translation adjustments	(4,132)
Balance (in shares) at Jun. 30, 2018		12,276			(806)
Balance at Jun. 30, 2018	301,447	$ 123	56,235	292,974	$ (24,999)	(22,886)
Balance (in shares) at Dec. 31, 2017		12,257			(806)
Balance at Dec. 31, 2017	312,974	$ 122	54,960	301,959	$ (24,999)	(19,068)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(3,330)			(3,330)
Foreign currency translation adjustments	(1,275)					(1,275)
Stock-based compensation	998		998
Issuance of restricted stock (In shares)		12
Issuance of restricted stock	1	$ 1
Dividends paid	(2,976)			(2,976)
Balance (in shares) at Mar. 31, 2018		12,269			(806)
Balance at Mar. 31, 2018	306,392	$ 123	55,958	295,653	$ (24,999)	(20,343)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	301			301
Foreign currency translation adjustments	(2,543)					(2,543)
Stock-based compensation (in shares)		5
Stock-based compensation	417		417
Shares withheld in lieu of employee tax withholding	(140)		(140)
Issuance of restricted stock (In shares)		2
Issuance of restricted stock	0
Dividends paid	(2,980)			(2,980)
Balance (in shares) at Jun. 30, 2018		12,276			(806)
Balance at Jun. 30, 2018	301,447	$ 123	56,235	292,974	$ (24,999)	(22,886)
Balance (in shares) at Sep. 30, 2018		12,281			(806)
Balance at Sep. 30, 2018	301,644	$ 123	56,769	291,530	$ (24,999)	(21,779)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(2,695)			(2,695)
Foreign currency translation adjustments	(4,088)					(4,088)
Stock-based compensation (in shares)		41
Stock-based compensation	1,220		1,220
Shares withheld in lieu of employee tax withholding	(731)		(731)
Dividends paid	(2,992)			(2,992)
Balance (in shares) at Dec. 31, 2018		12,322			(806)
Balance at Dec. 31, 2018	292,358	$ 123	57,258	285,843	$ (24,999)	(25,867)
Balance (in shares) at Sep. 30, 2018		12,281			(806)
Balance at Sep. 30, 2018	301,644	$ 123	56,769	291,530	$ (24,999)	(21,779)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	3,352
Foreign currency translation adjustments	(1,416)
Balance (in shares) at Jun. 30, 2019		12,359			(806)
Balance at Jun. 30, 2019	295,659	$ 124	57,838	285,891	$ (24,999)	(23,195)
Balance (in shares) at Dec. 31, 2018		12,322			(806)
Balance at Dec. 31, 2018	292,358	$ 123	57,258	285,843	$ (24,999)	(25,867)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	958			958
Foreign currency translation adjustments	1,720					1,720
Stock-based compensation (in shares)		17
Stock-based compensation	670	$ 1	669
Shares withheld in lieu of employee tax withholding	(416)		(416)
Issuance of restricted stock (In shares)		14
Dividends paid	(2,996)			(2,996)
Balance (in shares) at Mar. 31, 2019		12,353			(806)
Balance at Mar. 31, 2019	292,294	$ 124	57,511	283,805	$ (24,999)	(24,147)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	5,089			5,089
Foreign currency translation adjustments	952					952
Stock-based compensation (in shares)		6
Stock-based compensation	331	$ 0	331
Shares withheld in lieu of employee tax withholding	(4)		(4)
Dividends paid	(3,003)			(3,003)
Balance (in shares) at Jun. 30, 2019		12,359			(806)
Balance at Jun. 30, 2019	$ 295,659	$ 124	$ 57,838	$ 285,891	$ (24,999)	$ (23,195)