Allowances for Doubtful Accounts (Tables)

12 Months Ended

Dec. 31, 2012

Changes in Allowance for Doubtful Accounts

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