Fair Value of Assets and Liabilities (Tables)

12 Months Ended

Dec. 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:

	December 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	$	136,653	$	136,653	$	—	$	215,010	$	215,010	$	—
U.S. dollar indexed bond funds	—		—		—		27,978		—		27,978
Assets held in rabbi trusts	9,771		9,771		—		10,377		10,377		—
Foreign exchange forward contracts	2,964		—		2,964		1,382		—		1,382
Total	$	149,388	$	146,424	$	2,964	$	254,747	$	225,387	$	29,360
Liabilities
Deferred compensation	$	9,771	$	9,771	$	—	$	10,377	$	10,377	$	—
Foreign exchange forward contracts	967		—		967		364		—		364
Interest rate swaps	1,212		—		1,212		2,351		—		2,351
Total	$	11,950	$	9,771	$	2,179	$	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:

	December 31, 2014				December 31, 2013
	Fair Value		Carrying Value		Fair Value		Carrying Value
Notes payable	$	25,575	$	25,575	$	43,791	$	43,791
Long-term debt	483,621		479,794		489,499		480,242
Total debt instruments	$	509,196	$	505,369	$	533,290	$	524,033