ACCOUNTS RECEIVABLE

12 Months Ended

Dec. 31, 2015

ACCOUNTS RECEIVABLE [Abstract]

ACCOUNTS RECEIVABLE

(5) ACCOUNTS RECEIVABLE 

Accounts receivable consisted of the following:

	December 31,
	2014			2015
Accounts receivable		300,623,051			242,081,504
Allowance for doubtful accounts		(4,991,223	)		(6,519,594	)
Accounts receivable, net		295,631,828			235,561,910

 The following table presents movements in the allowance for doubtful accounts:

	December 31,
	2013			2014			2015
Balance at the beginning of year		1,503,621			2,254,798			4,991,223
Additions		2,650,128			5,256,461			7,504,977
Write-offs		(1,898,952	)		(2,520,036	)		(5,976,606	)
Balance at the end of year		2,254,797			4,991,223			6,519,594

The write-offs in 2013, 2014 and 2015 consisted of a combination of accounts receivable from individual and corporate customers and travel suppliers.