Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Common stock [Member]	Additional paid-in capital [Member]	Accumulated deficit [Member]	Treasury stock [Member]	Non-controlling interest [Member]	Total
Balance at Dec. 31, 2013	$ 464	$ 548,304	$ (484,352)	$ (4,643)	$ 0	$ 59,773
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	0	0	14,421	0	0	14,421
Equity contribution attributable to non-controlling interest	0	0	0	0	4,100	4,100
Return of non-controlling interest contribution						0
Common stock repurchased for treasury	0	0	0	(525)	0	(525)
Balance at Dec. 31, 2014	464	548,304	(469,931)	(5,168)	4,100	77,769
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	0	0	(4,591)	0	(34)	(4,625)
Equity contribution attributable to non-controlling interest	0	0	0	0	5,802	5,802
Return of non-controlling interest contribution	0	0	0	0	(9,868)	(9,868)
Common stock repurchased for treasury	0	0	0	0	0	0
Balance at Dec. 31, 2015	$ 464	$ 548,304	$ (474,522)	$ (5,168)	$ 0	$ 69,078