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Derivative Financial Instruments (Details) (Cross currency interest rate, Non-Designated Hedging Instruments, USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Cross currency interest rate \| Non-Designated Hedging Instruments
Fair value of derivative instruments
Notional Amount	$ 416,636	$ 416,636
Derivative Assets	$ 14,049	$ 26,699

Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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