Consolidated Statements of Changes in Stockholders' Equity (USD $) In Thousands, unless otherwise specified	Common stock [Member]	Additional paid-in capital [Member]	Accumulated deficit [Member]	Treasury stock [Member]	Non-controlling interest [Member]	Total
Balance at Dec. 31, 2012	$ 464	$ 548,304	$ (478,334)	$ (2,168)	$ 0	$ 68,266
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	0	0	(6,018)	0	0	(6,018)
Net income (loss) attributable to non-controlling interest	0	0	0	0	0	0
Equity contribution attributable to non-controlling interest	0	0	0	0	4,100	4,100
Common stock repurchased for treasury	0	0	0	(2,475)	0	(2,475)
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
Net income (loss) attributable to non-controlling interest						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