Fair Value of Assets and Liabilities (Tables)

12 Months Ended

Dec. 31, 2013

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:

	December 31, 2013						December 31, 2012
			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	$	215,010	$	215,010	$	—	$	258,518	$	258,518	$	—
U.S. dollar indexed bond funds	27,978		—		27,978		3,368		—		3,368
Assets held in rabbi trusts	10,377		10,377		—		6,783		6,783		—
Foreign exchange forward contracts	1,382		—		1,382		960		—		960
Total	$	254,747	$	225,387	$	29,360	$	269,629	$	265,301	$	4,328
Liabilities
Deferred compensation	$	10,377	$	10,377	$	—	$	6,783	$	6,783	$	—
Foreign exchange forward contracts	364		—		364		913		—		913
Interest rate swaps	2,351		—		2,351		3,558		—		3,558
Total	$	13,092	$	10,377	$	2,715	$	11,254	$	6,783	$	4,471

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:

	December 31, 2013				December 31, 2012
	Fair Value		Carrying Value		Fair Value		Carrying Value
Notes payable	$	43,791	$	43,791	$	34,212	$	34,212
Long-term debt	489,499		480,242		630,450		617,534
Total debt instruments	$	533,290	$	524,033	$	664,662	$	651,746