Changes in the allowance for doubtful accounts during each of the three years in the period ended December 31, were as follows:


	Year ended December 31,
	2012			2011			2010
Balance, beginning of year	$	24,510		$	20,863		$	10,066
Effect of foreign exchange movement on opening balance		2,513			(2,725	)		1,770
Change in provision for bad debts—reported in statement of operations		6,436			6,372			9,027
Other, including charge-offs		(8,209	)		0			0

Balance, end of year	$	25,250		$	24,510		$	20,863