CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - 3 months ended Mar. 31, 2017 - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional paid-in capital [Member]	Retained earnings [Member]	Treasury stock [Member]	Deferred Compensation, Share-based Payments [Member]	Accumulated other comprehensive income (loss) [Member]	Parent [Member]	Noncontrolling interest [Member]
Variable Interest Entity, Members Draw	$ (101)							$ 0	$ (101)
Balance, Beginning (in shares) at Dec. 31, 2016		54,169,880
Balance, Beginning at Dec. 31, 2016	292,879		479,075	$ 17,214	$ (10,119)	$ (1,075)	$ (188,278)	296,817	(3,938)
Net loss	(10,585)			(11,453)				(11,453)
Currency translation adjustment	11,019						9,104	9,104
Pension liability adjustments, net of tax	733						733	733
Dividends	(298)			(298)				(298)
Noncontrolling Interest, Period Increase (Decrease)	0
Noncontrolling Interest, Change in Redemption Value	(941)		941					941
Stock-based compensation	204		204					204
Issuance of treasury stock under 401(k) plan (in shares)		11,567
Issuance of treasury stock under 401(k) plan	131		27		104			131
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest	(11,205)								248
Temporary Equity, Foreign Currency Translation Adjustments	$ 8,683								(421)
Balance, Ending (in shares) at Mar. 31, 2017	59,643,711	59,643,711
Balance, Ending at Mar. 31, 2017	$ 350,427		538,707	$ 5,463	$ (10,015)	$ (1,075)	$ (178,441)	354,639	$ (4,212)
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest	620
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax, Portion Attributable to Noncontrolling Interest	2,337
Stockholders' Equity, Other Shares		5,462,264
Stockholders' Equity, Other	$ 58,460		$ (58,460)					$ (58,460)