Fair Value Measurements and Derivative Instruments 2 (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Derivative [Line Items]
Fair Value Asset Derivatives Designated Foreign Exchange Contracts	$ 369,000		$ 369,000		$ 780,000
Fair Value Asset Derivatives Designated Interest Rate Swaps	11,643,000		11,643,000		15,465,000
Fair Value Liability Derivatives Designated Foreign Exchange Contracts	(240,000)		(240,000)		(79,000)
Derivative Asset Not Designated As Hedging Instruments Fair Value	818,000		818,000		3,450,000
Derivative Liability Not Designated Foreign Exchange Contracts	(5,194,000)		(5,194,000)		(1,360,000)
Derivative Assets	12,830,000		12,830,000		19,695,000
Derivative Liabilities	(5,434,000)		(5,434,000)		(1,439,000)
Derivative Assets Liabilities At Fair Value Net	7,396,000		7,396,000		18,256,000
Derivative gain (loss) recognized in interest expense	1,578,000	3,488,000	8,351,000	8,406,000
Hedged item income (expense) recognized in interest expense	(5,484,000)	(10,109,000)	(25,652,000)	(23,016,000)
Total notional amount of outstanding contracts in cash flow hedging relationships	21,000,000		21,000,000		19,000,000
Derivative Asset, Fair Value, Net	1,000,000		1,000,000
Derivative gain (loss) recognized in OCI for hedges recorded to revenue (effective portion)	(863,000)	1,746,000	(1,672,000)	2,049,000
Derivative gain (loss) reclassified from AOCI to income for hedges recorded to revenue (effective portion)	456,000	(129,000)	1,230,000	(260,000)
Derivative gain (loss) reclassified from AOCI to income for hedges recorded to cost of sales (effective portion)	(56,000)	(146,000)	(129,000)	(700,000)
Derivative gain (loss) reclassified from AOCI to income for hedges (effective portion)	400,000	(275,000)	1,101,000	(960,000)
Derivative gain (loss) recognized in income	939,000	2,090,000	(2,129,000)	(18,770,000)
Amount of collateral that would be required to be posted if our long-term senior unsecured debt ratings was to have fallen below BB-/Ba3	5,000,000		5,000,000
Foreign Exchange Contract Intercompany [Member]
Derivative [Line Items]
Foreign Currency Derivative Liabilities at Fair Value	4,000,000		4,000,000
Foreign Currency Derivative Assets at Fair Value					$ 2,000,000