Income Taxes (Details 3) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Balance sheet presentation of the Company's deferred income taxes
Current deferred tax assets	$ 3,187	$ 1,659
Current deferred tax liabilities	(291)	(290)
Net current deferred tax assets before valuation allowance	2,896	1,369
Valuation allowance against current deferred tax assets		(1,369)
Net current deferred tax assets	2,896
Non-current deferred tax assets	100,200	83,835
Non-current deferred tax liabilities	(188)	(241)
Net non-current deferred tax assets before valuation allowance	100,012	83,594
Valuation allowance against non-current deferred tax assets		(83,594)
Net non-current deferred tax assets	100,012
Net deferred tax assets	$ 102,908