Fair Value Measurements and Derivative Instruments 2 (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Derivative [Line Items]
Fair Value Asset Derivatives Designated Foreign Exchange Contracts	$ 558,000		$ 78,000
Fair Value Asset Derivatives Designated Interest Rate Swaps	3,980,000		10,117,000
Fair Value Liability Derivatives Designated Foreign Exchange Contracts	(425,000)		(320,000)
Derivative Asset Not Designated As Hedging Instruments Fair Value	1,096,000		2,504,000
Derivative Liability Not Designated Foreign Exchange Contracts	(2,863,000)		(854,000)
Derivative Assets	5,634,000		12,699,000
Derivative Liabilities	(3,288,000)		(1,174,000)
Derivative Assets Liabilities At Fair Value Net	2,346,000		11,525,000
Derivative gain (loss) recognized in interest expense	1,993,000	3,327,000
Hedged item income (expense) recognized in interest expense	(5,484,000)	(10,109,000)
Total notional amount of outstanding contracts in cash flow hedging relationships	30,000,000		25,000,000
Derivative gain (loss) recognized in OCI for hedges recorded to revenue (effective portion)	630,000	(659,000)
Derivative gain (loss) reclassified from AOCI to income for hedges recorded to revenue (effective portion)	(382,000)	301,000
Derivative gain (loss) reclassified from AOCI to income for hedges recorded to cost of sales (effective portion)	126,000	(66,000)
Derivative gain (loss) reclassified from AOCI to income for hedges (effective portion)	(256,000)	235,000
Derivative gain (loss) recognized in income	(4,351,000)	(4,224,000)
Document Fiscal Year Focus	2013
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	2,000,000
Foreign Exchange Contract Intercompany [Member]
Derivative [Line Items]
Foreign Currency Derivative Liabilities at Fair Value	$ 2,000,000