Fair Value of Financial Instruments and Non-Financial Assets - Fair Value of Level 3 Assets (Details) (Fair Value, Measurements, Recurring [Member], Fair Value, Inputs, Level 3 [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance, January 1	$ 0	$ 2,731
Total gains (losses):
Included in net loss	0	3,341
Included in comprehensive income (loss)	0	(1,680)
Purchases and (sales)
Sales	0	(4,392)
Transfers in (out) of Level 3	0	0
Ending Balance, Decedmber 31	$ 0	$ 0