Derivative Instruments and Hedging Activities (Details) (Fair value of derivative instruments [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Summary of the fair values of outstanding derivative instruments
Total derivative liabilities	$ 10,951
Interest rate contract (interest rate swap) [Member] | Derivative designated as a hedging instrument [Member] | Current liabilities - derivative instruments [Member]
Summary of the fair values of outstanding derivative instruments
Total derivative liabilities	459
Equity contract (the Warrant) [Member] | Derivative not designated as a hedging instrument [Member] | Current liabilities - derivative instruments [Member]
Summary of the fair values of outstanding derivative instruments
Total derivative liabilities	$ 10,492