Condensed Consolidated Statements of Changes in Equity - USD ($) $ in Thousands	Total	Series A Convertible Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income [Member]	Accumulated Deficit [Member]	Treasury Stock [Member]	Noncontrolling Interests [Member]
Beginning balances at Dec. 31, 2014	$ 308,509	$ 909	$ 70	$ 376,297	$ (583)	$ (68,137)	$ (96)	$ 49
Beginning balances, shares at Dec. 31, 2014		90,973	70,109,488				29,990
Vesting of restricted stock units, shares			227,382
Stock-based compensation	3,222		$ 1	3,221
Common stock issued as payment for MPUs	358			358
Common stock issued as payment for MPUs, shares			54,801
Series A convertible preferred stock dividend		$ 27				(27)
Series A convertible preferred stock dividend, shares		2,734
Payment of contingent consideration	542
Exercise of SARs, shares			62,725
Exercise of stock options	244			244
Exercise of stock options, shares			50,000
Net income (loss)	(13,315)					(13,490)		175
Foreign currency translation adjustments	(358)				(408)			50
Ending balances at Sep. 30, 2015	298,660	$ 936	$ 71	380,120	(991)	(81,654)	$ (96)	274
Ending balances, shares at Sep. 30, 2015		93,707	70,504,396				29,990
Beginning balances at Dec. 31, 2015	299,756	$ 357	$ 71	381,659	(1,174)	(81,424)	$ (96)	363
Beginning balances, shares at Dec. 31, 2015		35,759	70,613,642				29,990
Vesting of restricted stock units, shares			261,730
Stock-based compensation	3,417			3,417
Conversion of preferred stock to common stock		$ (7)		7
Conversion of preferred stock to common stock, shares		(708)	1,178
Series A convertible preferred stock dividend		$ 7				(7)
Series A convertible preferred stock dividend, shares		706
Payment of contingent consideration	352			352
Payment of contingent consideration, shares			35,464
Exercise of SARs, shares			131,774
Net income (loss)	(20,148)					(20,306)		158
Foreign currency translation adjustments	863				870			(7)
Ending balances at Sep. 30, 2016	$ 284,240	$ 357	$ 71	$ 385,435	$ (304)	$ (101,737)	$ (96)	$ 514
Ending balances, shares at Sep. 30, 2016		35,757	71,043,788				29,990