Fair Value of Assets and Liabilities (Tables)

3 Months Ended

Mar. 31, 2012

Fair Value Disclosures [Abstract]

Summary of Assets and Liabilities Recorded at Fair Market Value

Assets and liabilities subject to fair value measurement are as follows:

	March 31, 2012						December 31, 2011
			Fair Value Measurements Using						Fair Value Measurements Using
	Fair Value		Level 1		Level 2		Fair Value		Level 1		Level 2
Assets
Short-term investments:
Certificates of deposit	$	264,896	$	264,896	$	—	$	269,033	$	269,033	$	—
U.S. dollar indexed bond funds	35,155		—		35,155		17,820		—		17,820
Assets held in a rabbi trust	7,808		7,808		—		7,170		7,170		—
Foreign exchange forward contracts	1,156		—		1,156		2,193		—		2,193
Total	$	309,015	$	272,704	$	36,311	$	296,216	$	276,203	$	20,013
Liabilities
Deferred compensation	$	7,808	$	7,808	$	—	$	7,170	$	7,170	$	—
Foreign exchange forward contracts	582		—		582		1,983		—		1,983
Interest rate swaps	3,631		—		3,631		3,796		—		3,796
Total	$	12,021	$	7,808	$	4,213	$	12,949	$	7,170	$	5,779

Fair value and carrying value of the Company's debt instruments

The fair value and carrying value of the Company’s debt instruments are summarized as follows:

	March 31, 2012				December 31, 2011
	Fair Value		Carrying Value		Fair Value		Carrying Value
Notes payable	$	39,425	$	39,425	$	21,722	$	21,722
Long-term debt	628,538		618,095		612,551		606,154
Total debt instruments	$	667,963	$	657,520	$	634,273	$	627,876