Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2011

Fair Value Measurements [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis

	December 31, 2011								December 31, 2010
	Total		Level 1		Level 2		Level 3		Total	Level 1	Level 2	Level 3
Assets:
Cash equivalents	$	13,619	$	—	$	13,619	$	—	243,514	230,000	13,514	—
Foreign currency forward contracts	545		—		545		—		1,763	—	1,763	—
Total	$	14,164	$	—	$	14,164	$	—	245,277	230,000	15,277	—
Liabilities:
Interest rate swap agreements	$	9,175	$	—	$	9,175	$	—	5,842	—	5,842	—
Foreign currency forward contracts	480		—		480		—		305	—	305	—
Total	$	9,655	$	—	$	9,655	$	—	6,147	—	6,147	—