Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Assets:
Cash Equivalents	$ 9,319	$ 13,636
Foreign Currency Cash Flow Hedge Asset at Fair Value	100
Foreign Currency Derivative Instruments Not Designated As Hedging Instruments Asset At Fair Value	300	400
Liabilities:
Foreign Currency Cash Flow Hedge Liability at Fair Value	800	400
Foreign Currency Derivative Instruments Not Designated As Hedging Instruments Liability At Fair Value	600	300
Fair Value, Measurements, Recurring [Member]
Assets:
Cash Equivalents	9,319	13,636
Foreign Currency Cash Flow Hedge Asset at Fair Value	100	0
Foreign Currency Derivative Instruments Not Designated As Hedging Instruments Asset At Fair Value	301	448
Total Assets at Fair Value	9,720	14,084
Liabilities:
Interest Rate Cash Flow Hedge Liability at Fair Value	7,477	8,172
Foreign Currency Cash Flow Hedge Liability at Fair Value	834	421
Foreign Currency Derivative Instruments Not Designated As Hedging Instruments Liability At Fair Value	568	280
Total Liabilities at Fair Value	8,879	8,873
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Assets:
Cash Equivalents	0	0
Foreign Currency Cash Flow Hedge Asset at Fair Value	0	0
Foreign Currency Derivative Instruments Not Designated As Hedging Instruments Asset At Fair Value	0	0
Total Assets at Fair Value	0	0
Liabilities:
Interest Rate Cash Flow Hedge Liability at Fair Value	0	0
Foreign Currency Cash Flow Hedge Liability at Fair Value	0	0
Foreign Currency Derivative Instruments Not Designated As Hedging Instruments Liability At Fair Value	0	0
Total Liabilities at Fair Value	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Assets:
Cash Equivalents	9,319	13,636
Foreign Currency Cash Flow Hedge Asset at Fair Value	100	0
Foreign Currency Derivative Instruments Not Designated As Hedging Instruments Asset At Fair Value	301	448
Total Assets at Fair Value	9,720	14,084
Liabilities:
Interest Rate Cash Flow Hedge Liability at Fair Value	7,477	8,172
Foreign Currency Cash Flow Hedge Liability at Fair Value	834	421
Foreign Currency Derivative Instruments Not Designated As Hedging Instruments Liability At Fair Value	568	280
Total Liabilities at Fair Value	8,879	8,873
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Assets:
Cash Equivalents	0	0
Foreign Currency Cash Flow Hedge Asset at Fair Value	0	0
Foreign Currency Derivative Instruments Not Designated As Hedging Instruments Asset At Fair Value	0	0
Total Assets at Fair Value	0	0
Liabilities:
Interest Rate Cash Flow Hedge Liability at Fair Value	0	0
Foreign Currency Cash Flow Hedge Liability at Fair Value	0	0
Foreign Currency Derivative Instruments Not Designated As Hedging Instruments Liability At Fair Value	0	0
Total Liabilities at Fair Value	$ 0	$ 0