Income Taxes - Components of U.S. and Foreign deferred income tax expense (benefit) (Details 1) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Line Items]
Valuation allowance (decrease) increase	$ (36,465,000)
United States
Income Taxes [Line Items]
Deferred tax expense (benefit)	10,661,000	17,774,000	(652,000)
Net operating loss carryforward expired (generated)	26,924,000	187,597,000	(14,168,000)
Valuation allowance (decrease) increase	(37,585,000)	(205,371,000)	14,820,000
Provision for Income taxes
Foreign
Income Taxes [Line Items]
Deferred tax expense (benefit)	(1,041,000)	(1,268,000)	(823,000)
Net operating loss carryforward expired (generated)	(79,000)	496,000	(1,081,000)
Valuation allowance (decrease) increase	1,120,000	772,000	1,904,000
Provision for Income taxes