Income Taxes (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Income Tax Disclosure [Abstract]
U.S. statutory rate	$ (23,815)		$ (77,004)		$ (46,856)
Non-deductible expenses	4,992		50,160		1,312
State taxes, net of benefit	(2)		21		0
Effect of foreign tax rate differential	5,638		11,014		9,581
Foreign withholding taxes	4,260		4,746		4,184
Foreign tax credit	(4,408)		(13,245)		0
Non-taxable/non-deductible derivative (gains) losses	(2,006)		(11,655)		2,245
Unrecognized tax benefits	639		1,773		764
Return to accrual items	(6,165)		(4,287)		4,760
Change in valuation allowance	35,785		40,517		28,820
Total provision for income taxes	$ 14,918	[1]	$ 2,040	[1]	$ 4,810	[1]

[1] During the fourth quarter of 2010, the Company re-assessed its operating segments and concluded that its multi-client data library business is a separate operating segment. Accordingly, prior periods have been restated.