Accrued Expenses (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Accrued Liabilities [Abstract]
Foreign taxes payable	$ 18,989	$ 445
Accrued interest	25,932	3,186
Dividends Payable [Line Items]
Preferred dividends	1,617	1,459
Accrued Compensation	1,882	4,671
Asset Retirement Obligation, Current	36,255	2,078
Development Asset Accrual	0	6,160
Other	5,425	2,550
Total accrued expenses and other liabilities	$ 90,100	$ 20,549