Income Taxes (Details 4) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Components of Deferred Tax Assets [Abstract]
Net operating loss and other credit carryforwards	$ 47,910	$ 43,009
Compensation and benefits	1,573	1,600
Unrealized gain/(loss)	0	93
Inventories	96	85
Intangible assets	52,444	52,453
Pension plan	3,384	4,541
Allowance for doubtful accounts	2,507	2,162
Deferred revenue	3,925	7,281
Foreign tax credit and offset to branch deferreds	92,559	77,294
Other	16,046	6,793
less: valuation allowance	(155,757)	(145,408)
Net deferred tax assets	64,687	49,903
Components of Deferred Tax Liabilities [Abstract]
Intangible assets	(8,952)	(9,175)
Prepaid expenses	(150)	(142)
Property, plant and equipment	(78,413)	(76,620)
Equity Investment in partnerships	(36,749)	(28,696)
Other	(5,876)	(8,585)
Total deferred tax liabilities	(130,140)	(123,218)
Net deferred tax assets (liabilities)	$ (65,453)	$ (73,315)