Condensed Consolidated Statements of Equity - USD ($) $ in Thousands	Common Shares in Treasury [Member]	Common Stock [Member]	Paid-in Capital [Member]	Retained Earnings (Deficit) [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Non-controlling Interests [Member]	Total
Beginning Balances at Dec. 31, 2013	$ (143,802)	$ 93,436	$ 318,055	$ (14,664)	$ 8,493	$ 12,325	$ 273,843
Beginning Balances, shares at Dec. 31, 2013	6,730,000
Net income (loss)				27,164		(43)	27,121
Other comprehensive loss					(33)	(507)	(540)
Stock-based compensation transactions	$ 7,154		(2,516)				4,638
Stock-based compensation transactions, shares	(268,000)
Distributions to noncontrolling interests						(206)	(206)
Ending Balances at Jun. 30, 2014	$ (136,648)	93,436	315,539	12,500	8,460	11,569	304,856
Ending Balances, shares at Jun. 30, 2014	6,462,000
Beginning Balances at Dec. 31, 2014	$ (136,058)	93,436	317,404	71,407	(21,805)	11,632	336,016
Beginning Balances, shares at Dec. 31, 2014	6,445,000
Net income (loss)				17,569		(1,769)	15,800
Other comprehensive loss					(27,252)	(1,139)	(28,391)
Stock-based compensation transactions	$ 8,003		(3,310)				4,693
Stock-based compensation transactions, shares	(280,000)
Ending Balances at Jun. 30, 2015	$ (128,055)	$ 93,436	$ 314,094	$ 88,976	$ (49,057)	$ 8,724	$ 328,118
Ending Balances, shares at Jun. 30, 2015	6,165,000