CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
CONSOLIDATED BALANCE SHEETS
Accounts receivable, allowance for doubtful accounts (in dollars)	$ 11,185	$ 10,347
Other receivable, allowance for doubtful accounts (in dollars)	$ 416	$ 315
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	27,277,939	26,693,248
Common stock, shares outstanding	27,277,939	26,693,248