Income Taxes (Income Tax Expense) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Current income tax expense	$ 0	$ 0	$ 0	$ 2
Deferred income tax expense (benefit)	(351)	599	761	1,109
Total income tax expense (benefit)	(351)	599	761	1,111
Net deferred tax assets	$ 12,555		$ 12,555		$ 10,533