Fair Value of Assets and Liabilities (Tables)

9 Months Ended

Sep. 30, 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:

	September 30, 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	$	133,800	$	133,800	$	—	$	215,010	$	215,010	$	—
U.S. dollar indexed bond funds	—		—		—		27,978		—		27,978
Assets held in rabbi trusts	9,662		9,662		—		10,377		10,377		—
Foreign exchange forward contracts	5,151		—		5,151		1,382		—		1,382
Total	$	148,613	$	143,462	$	5,151	$	254,747	$	225,387	$	29,360
Liabilities
Deferred compensation	$	9,662	$	9,662	$	—	$	10,377	$	10,377	$	—
Foreign exchange forward contracts	180		—		180		364		—		364
Interest rate swaps	1,478		—		1,478		2,351		—		2,351
Total	$	11,320	$	9,662	$	1,658	$	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:

	September 30, 2014				December 31, 2013
	Fair Value		Carrying Value		Fair Value		Carrying Value
Notes payable	$	83,612	$	83,612	$	43,791	$	43,791
Long-term debt	561,280		555,020		489,499		480,242
Total debt instruments	$	644,892	$	638,632	$	533,290	$	524,033