Financial Instruments (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Interest Rate Cash Flow Hedge Derivative at Fair Value, Net	$ 8,200,000	$ 9,200,000
Unrealized Gain (Loss) on Interest Rate Cash Flow Hedges, Pretax, Accumulated Other Comprehensive Income (Loss)	(2,000,000)	(6,300,000)
Unrealized Gain (Loss) on Interest Rate Cash Flow Hedge, Net of Tax, Accumulated Other Comprehensive Income (Loss)	(1,252,000)	(4,000,000)
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	3,000,000	3,000,000
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net, Net of Tax	1,900,000	1,900,000
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	3,000,000
Notional Amount of Foreign Currency Cash Flow Hedge Derivatives	78,000,000
Foreign Currency Cash Flow Hedge Derivative at Fair Value, Net	421,000	0
Unrealized Gain (Loss) on Foreign Currency Derivatives, Net, before Tax	(600,000)
Unrealized Gain (Loss) on Foreign Currency Derivatives, Net, After Tax	(500,000)
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	200,000
Foreign Currency Cash Flow Hedge Gain Loss Reclassified To Earnings,Net, After Tax	200,000
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months	421,000
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments	3,000,000
Cash Flow Hedge Settlement (Textuals) [Abstract]
Line Of Credit Facility Forecasted Borrowing Amount	(100,000,000)
Derivative, Fixed Interest Rate	3.24%
Financial Instruments (Textuals) [Abstract]
Long Term Debt Percentage Bearing Fixed Interest Percentage	64.00%
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value	400,000	500,000
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value	300,000	500,000
Notional Amount of Other Derivatives Not Designated as Hedging Instruments	$ 132,300,000	$ 143,600,000