Fair Value Measurements (Fair Value Assets (Liabilities) Measured On Recurring Basis) (Details) (USD $)	9 Months Ended				12 Months Ended
	Sep. 30, 2011		Sep. 30, 2010		Dec. 31, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate contracts	$ 1,000		$ 4,000		$ 7,000
Forward currency exchange contracts	311,000		42,000		(577,000)
Nonqualified savings plan assets	7,705,000	[1]	6,498,000	[1]	7,073,000	[1]
Available for sale securities	5,003,000	[2]	8,480,000	[2]	3,650,000	[2]
Total	13,020,000		15,024,000		10,153,000
Unrealized total gains / (losses) recorded in accumulated other comprehensive income	(600,000)		2,800,000		(2,000,000)
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate contracts
Forward currency exchange contracts
Nonqualified savings plan assets	7,705,000	[1]	6,498,000	[1]	7,073,000	[1]
Available for sale securities	5,003,000	[2]	8,480,000	[2]	3,650,000	[2]
Total	12,708,000		14,978,000		10,723,000
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate contracts	1,000		4,000		7,000
Forward currency exchange contracts	311,000		42,000		(577,000)
Nonqualified savings plan assets		[1]		[1]		[1]
Available for sale securities		[2]		[2]		[2]
Total	312,000		46,000		(570,000)
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate contracts
Forward currency exchange contracts
Nonqualified savings plan assets		[1]		[1]		[1]
Available for sale securities		[2]		[2]		[2]
Total

[1] The non-qualified savings plan assets have an offsetting liability of equal amount, which is included in "Accounts payable and accrued expenses" in the Company's consolidated balance sheets.

[2] Unrealized total (losses) gains on these securities of ($0.6) million, $2.8 million and ($2.0) million as of September 30, 2011 and 2010 and December 31, 2010, respectively, are recorded in "Accumulated other comprehensive income (loss)" in the Company's consolidated statements of equity.