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	2,073			2,073
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		$ 18				(18)
Series A convertible preferred stock dividend, shares		1,813
Exercise of SARs, shares			44,502
Exercise of stock options	244			244
Exercise of stock options, shares			50,000
Net income (loss)	(14,960)					(15,081)		121
Foreign currency translation adjustments	(544)				(598)			54
Ending balances at Jun. 30, 2015	295,680	$ 927	$ 70	378,972	(1,181)	(83,236)	$ (96)	224
Ending balances, shares at Jun. 30, 2015		92,786	70,486,173				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	2,337			2,337
Conversion of preferred stock to common stock		$ (7)		7
Conversion of preferred stock to common stock, shares		(708)	1,178
Payment of contingent consideration	352			352
Payment of contingent consideration, shares			35,464
Exercise of SARs, shares			97,074
Net income (loss)	(6,159)					(6,265)		106
Foreign currency translation adjustments	672				678			(6)
Ending balances at Jun. 30, 2016	$ 296,958	$ 350	$ 71	$ 384,355	$ (496)	$ (87,689)	$ (96)	$ 463
Ending balances, shares at Jun. 30, 2016		35,051	71,009,088				29,990