Fair Value of Assets and Liabilities (Tables)

3 Months Ended

Mar. 31, 2014

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, 2014						December 31, 2013
			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	$	169,652	$	169,652	$	—	$	215,010	$	215,010	$	—
U.S. dollar indexed bond funds	39,365		—		39,365		27,978		—		27,978
Assets held in rabbi trusts	10,161		10,161		—		10,377		10,377		—
Foreign exchange forward contracts	96		—		96		1,382		—		1,382
Total	$	219,274	$	179,813	$	39,461	$	254,747	$	225,387	$	29,360
Liabilities
Deferred compensation	$	10,161	$	10,161	$	—	$	10,377	$	10,377	$	—
Foreign exchange forward contracts	2,828		—		2,828		364		—		364
Interest rate swaps	2,074		—		2,074		2,351		—		2,351
Total	$	15,063	$	10,161	$	4,902	$	13,092	$	10,377	$	2,715

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, 2014				December 31, 2013
	Fair Value		Carrying Value		Fair Value		Carrying Value
Notes payable	$	78,968	$	78,968	$	43,791	$	43,791
Long-term debt	466,182		457,076		489,499		480,242
Total debt instruments	$	545,150	$	536,044	$	533,290	$	524,033