Borrowings (Interest Rate Swap on Senior Secured Notes) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Debt Instrument [Line Items]
Fair market value of Rate Agreements - asset (liability)	$ (81)		$ 25
Adjustment to increase (decrease) the carrying value of the related long-term debt	408	[1]	4,043	[1]
Derivative Asset | Interest Rate Contracts | Designated as Hedging Instrument
Debt Instrument [Line Items]
Fair market value of Rate Agreements - asset (liability)	298		3,606
Other Income (Expense) | Fair Value Hedging | Interest Rate Contracts | Designated as Hedging Instrument
Debt Instrument [Line Items]
Income (expense) on hedging activities in other income (expense)	280		293		(730)
Loss on Redemption of Debt | Fair Value Hedging | Interest Rate Contracts | Designated as Hedging Instrument
Debt Instrument [Line Items]
Income on hedging activities in loss on redemption of debt	$ 3,502		$ 0		$ 0

[1] See Interest Rate Agreements under “Senior Secured Notes” below and in note 13.