Fair Value Measurements and Derivative Instruments (Tables)

12 Months Ended

Dec. 31, 2012

Fair Value Disclosures [Abstract]

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

	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	)

	December 31, 2011
	Level 1		Level 2			Level 3		Total
Assets:
Investment securities
Money market funds / commercial paper	$	239,157	$	300,702		$	—	$	539,859
Equity securities	—		22,097			—		22,097
Commingled fixed income securities	—		27,747			—		27,747
Debt securities - U.S. and foreign governments, agencies and municipalities	93,175		19,042			—		112,217
Debt securities - corporate	—		31,467			—		31,467
Mortgage-backed / asset-backed securities	—		134,262			—		134,262
Derivatives
Interest rate swaps	—		15,465			—		15,465
Foreign exchange contracts	—		4,230			—		4,230
Total assets	$	332,332	$	555,012		$	—	$	887,344
Liabilities:
Derivatives
Foreign exchange contracts	$	—	$	(1,439	)	$	—	$	(1,439	)
Total liabilities	$	—	$	(1,439	)	$	—	$	(1,439	)

Available-for-sale Securities [Table Text Block]

At December 31, 2012 and 2011, available-for-sale securities consisted of the following:

	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

	December 31, 2011
	Amortized cost		Gross unrealized gains		Gross unrealized losses			Estimated fair value
Money market funds / commercial paper	$	25,253	$	43	$	—		$	25,296
U.S. and foreign governments, agencies and municipalities	93,995		4,264		(8		)	98,251
Corporate	31,114		935		(582		)	31,467
Mortgage-back / asset-back securities	131,982		3,303		(1,023		)	134,262
Total	$	282,344	$	8,545	$	(1,613	)	$	289,276

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

At December 31, 2012, the amortized cost and estimated fair value of investment securities have scheduled maturities as follows:

	Amortized cost		Estimated fair value
Within 1 year	$	86,867	$	87,014
After 1 year through 5 years	56,732		58,117
After 5 years through 10 years	65,019		65,869
After 10 years	167,075		171,688
Total	$	375,693	$	382,688

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

		December 31,
Designation of Derivatives	Balance Sheet Location	2012			2011
Derivatives designated as hedging instruments	Other current assets and prepayments:
	Foreign exchange contracts	$	78		$	780
	Other assets:
	Interest rate swaps	10,117			15,465
	Accounts payable and accrued liabilities:
	Foreign exchange contracts	(320		)	(79		)
Derivatives not designated as hedging instruments	Other current assets and prepayments:
	Foreign exchange contracts	2,504			3,450
	Accounts payable and accrued liabilities:
	Foreign exchange contracts	(854		)	(1,360		)
	Total derivative assets	12,699			19,695
	Total derivative liabilities	(1,174		)	(1,439		)
	Total net derivative assets	$	11,525		$	18,256

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

		Year Ended December 31,
		Derivative Gain Recognized in Earnings				Hedged Item Expense Recognized in Earnings
Derivative Instrument	Location of Gain (Loss)	2012		2011		2012			2011
Interest rate swaps	Interest expense	$	9,994	$	11,583	$	(31,137	)	$	(33,125	)

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

	Year Ended December 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	2012			2011			2012			2011
Foreign exchange contracts	$	(2,055	)	$	2,141	Revenue	$	1,298		$	(166	)
						Cost of sales	(185		)	(719		)
							$	1,113		$	(885	)

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

		Year Ended December 31,
		Derivative Gain (Loss) Recognized in Earnings
Derivatives Instrument	Location of Derivative Gain (Loss)	2012			2011
Foreign exchange contracts	Selling, general and administrative expense	$	(4,254	)	$	(17,214	)

Fair Value, by Balance Sheet Grouping

	December 31,
	2012		2011
Carrying value	$	4,017,375	$	4,233,909
Fair value	$	4,200,970	$	4,364,176