CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
CONSOLIDATED BALANCE SHEETS
Trade accounts receivable, allowance for doubtful accounts (in dollars)	$ 483	$ 1,136
Trade accounts receivable from related parties	368	227
Prepayments to related parties	3,012
Accounts payable to related parties		22
Accrued liabilities to related parties	115	2,008
Deferred revenue from related parties	$ 61	$ 134
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	175,772,173	175,772,173
Common stock, shares issued	158,210,719	158,160,719
Common stock held in treasury, at cost	2,500,000