CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Trade accounts receivable, allowance for doubtful accounts	$ 2,560	$ 3,719
Convertible preferred stock, par value	$ 0.001	$ 0.001
Convertible preferred stock, shares authorized	1,000,000	1,000,000
Convertible preferred stock, shares outstanding
Common stock - Class A
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	30,000,000	30,000,000
Common stock, shares issued	2,731,860	2,731,860
Common stock, shares outstanding	2,731,860	2,731,860
Common stock - Class B
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares issued	2,861,843	2,861,843
Common stock, shares outstanding	2,861,843	2,861,843
Common stock - Class C
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares issued	3,121,048	3,121,048
Common stock, shares outstanding	3,121,048	3,121,048
Common stock - Class D
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares issued	41,409,667	41,409,667
Common stock, shares outstanding	41,409,667	41,409,667