Fair Value Measurements and Derivative Instruments (Tables)

3 Months Ended

Mar. 31, 2013

Fair Value Disclosures [Abstract]

Available-for-sale Securities [Table Text Block]

Scheduled maturities of investment securities at March 31, 2013 were as follows:

	Amortized cost		Estimated fair value
Within 1 year	$	53,086	$	53,218
After 1 year through 5 years	40,122		41,610
After 5 years through 10 years	76,310		79,377
After 10 years	166,958		171,040
Total	$	336,476	$	345,245

Schedule of Available-for-sale Securities Reconciliation [Table Text Block]

Available-for-sale securities at March 31, 2013 and December 31, 2012 consisted of the following:

	March 31, 2013
	Amortized cost		Gross unrealized gains		Gross unrealized losses			Estimated fair value
Money market funds / commercial paper	$	14,402	$	42	$	—		$	14,444
U.S. and foreign governments, agencies and municipalities	123,272		3,707		(135		)	126,844
Corporate	40,772		2,744		(48		)	43,468
Mortgage-back / asset-back securities	158,030		3,203		(744		)	160,489
Total	$	336,476	$	9,696	$	(927	)	$	345,245

	December 31, 2012
	Amortized cost		Gross unrealized gains		Gross unrealized losses			Estimated fair value
Money market funds / commercial paper	$	44,611	$	53	$	—		$	44,664
U.S. and foreign governments, agencies and municipalities	127,807		3,972		(56		)	131,723
Corporate	41,095		2,851		(20		)	43,926
Mortgage-back / asset-back securities	162,180		3,340		(3,145		)	162,375
Total	$	375,693	$	10,216	$	(3,221	)	$	382,688

Schedule of Other Derivatives Not Designated as Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block]

		Three Months Ended March 31,
		Derivative Gain (Loss) Recognized in Earnings
Derivatives Instrument	Location of Derivative Gain (Loss)	2013			2012
Foreign exchange contracts	Selling, general and administrative expense	$	(4,351	)	$	(4,224	)

Schedule of Cash Flow Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block]

	Three Months Ended March 31,
	Derivative Gain (Loss) Recognized in AOCI (Effective Portion)					Location of Gain (Loss) (Effective Portion)	Gain (Loss) Reclassified from AOCI to Earnings (Effective Portion)
Derivative Instrument	2013		2012				2013			2012
Foreign exchange contracts	$	630	$	(659	)	Revenue	$	(382	)	$	301
						Cost of sales	126			(66		)
							$	(256	)	$	235

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]

Designation of Derivatives	Balance Sheet Location	March 31, 2013			December 31, 2012
Derivatives designated as hedging instruments	Other current assets and prepayments:
	Foreign exchange contracts	$	558		$	78
	Other assets:
	Interest rate swaps	3,980			10,117
	Accounts payable and accrued liabilities:
	Foreign exchange contracts	(425		)	(320		)
Derivatives not designated as hedging instruments	Other current assets and prepayments:
	Foreign exchange contracts	1,096			2,504
	Accounts payable and accrued liabilities:
	Foreign exchange contracts	(2,863		)	(854		)
	Total derivative assets	$	5,634		$	12,699
	Total derivative liabilities	(3,288		)	(1,174		)
	Total net derivative assets	$	2,346		$	11,525

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

	March 31, 2013
	Level 1		Level 2			Level 3		Total
Assets:
Investment securities
Money market funds / commercial paper	$	532,425	$	37,554		$	—	$	569,979
Equity securities	—		27,198			—		27,198
Commingled fixed income securities	—		29,378			—		29,378
Debt securities - U.S. and foreign governments, agencies and municipalities	122,589		24,640			—		147,229
Debt securities - corporate	—		43,468			—		43,468
Mortgage-backed / asset-backed securities	—		160,489			—		160,489
Derivatives
Interest rate swaps	—		3,980			—		3,980
Foreign exchange contracts	—		1,654			—		1,654
Total assets	$	655,014	$	328,361		$	—	$	983,375
Liabilities:
Derivatives
Foreign exchange contracts	$	—	$	(3,288	)	$	—	$	(3,288	)
Total liabilities	$	—	$	(3,288	)	$	—	$	(3,288	)

	December 31, 2012
	Level 1		Level 2			Level 3		Total
Assets:
Investment securities
Money market funds / commercial paper	$	581,648	$	34,369		$	—	$	616,017
Equity securities	—		25,106			—		25,106
Commingled fixed income securities	—		29,359			—		29,359
Debt securities - U.S. and foreign governments, agencies and municipalities	124,221		18,908			—		143,129
Debt securities - corporate	—		43,926			—		43,926
Mortgage-backed / asset-backed securities	—		162,375			—		162,375
Derivatives
Interest rate swaps	—		10,117			—		10,117
Foreign exchange contracts	—		2,582			—		2,582
Total assets	$	705,869	$	326,742		$	—	$	1,032,611
Liabilities:
Derivatives
Foreign exchange contracts	$	—	$	(1,174	)	$	—	$	(1,174	)
Total liabilities	$	—	$	(1,174	)	$	—	$	(1,174	)

Fair Value, by Balance Sheet Grouping [Table Text Block]

	March 31, 2013		December 31, 2012
Carrying value	$	4,032,634	$	4,017,375
Fair value	$	4,229,484	$	4,200,970

Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block]

		Three Months Ended March 31,
		Derivative Gain Recognized in Earnings				Hedged Item Expense Recognized in Earnings
Derivative Instrument	Location of Gain (Loss)	2013		2012		2013			2012
Interest rate swaps	Interest expense	$	1,993	$	3,327	$	(5,484	)	$	(10,109	)