Consolidated Statements of Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock [Member]	Additional paid-in capital [Member]	Accumulated Deficit [Member]	Treasury Stock [Member]	Noncontrolling interest in consolidated affiliates [Member]
Beginning balance at Dec. 31, 2012	$ 104,881	$ 23	$ 4,993	$ (46)		$ 99,911
Beginning balance, Shares at Dec. 31, 2012		2,343,213
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	214		214
Net Income (Loss) Attributable to Parent	(840)
Net income (loss)	(1,824)					(984)
Ending balance at Mar. 31, 2013	103,271	23	5,207	(886)		98,927
Ending balance, Shares at Mar. 31, 2013		2,343,213
Beginning balance at Dec. 31, 2013	792,967	24	12,855	(5,339)		785,427
Beginning balance, Shares at Dec. 31, 2013	2,354,774	2,354,774
Treasury Stock, Shares, Acquired	42,240
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock, including option exercises, shares		41,429
Stock Issued During Period, Value, Other	18	0	18
Treasury Stock, Value, Acquired, Cost Method	(44,565)
Net income (loss)	468,491					468,491
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	(27,398)					(27,398)
Share-based compensation	3,316		3,316
Net Income (Loss) Attributable to Parent	6,828			6,828
Net income (loss)	48,741					41,913
Ending balance at Mar. 31, 2014	$ 1,241,570	$ 24	$ 16,189	$ 1,489	$ (44,565)	$ 1,268,433
Ending balance, Shares at Mar. 31, 2014	2,353,963	2,396,203