Fair Value of Assets and Liabilities (Tables)

6 Months Ended

Jun. 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:

	June 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	$	144,273	$	144,273	$	—	$	215,010	$	215,010	$	—
U.S. dollar indexed bond funds	8,697		—		8,697		27,978		—		27,978
Assets held in rabbi trusts	10,015		10,015		—		10,377		10,377		—
Foreign exchange forward contracts	217		—		217		1,382		—		1,382
Total	$	163,202	$	154,288	$	8,914	$	254,747	$	225,387	$	29,360
Liabilities
Deferred compensation	$	10,015	$	10,015	$	—	$	10,377	$	10,377	$	—
Foreign exchange forward contracts	1,670		—		1,670		364		—		364
Interest rate swaps	1,839		—		1,839		2,351		—		2,351
Total	$	13,524	$	10,015	$	3,509	$	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:

	June 30, 2014				December 31, 2013
	Fair Value		Carrying Value		Fair Value		Carrying Value
Notes payable	$	63,105	$	63,105	$	43,791	$	43,791
Long-term debt	499,900		490,432		489,499		480,242
Total debt instruments	$	563,005	$	553,537	$	533,290	$	524,033