Income Taxes (Income Tax Expense) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Current income tax expense	$ 0	$ 1	$ 2	$ 3
Deferred income tax expense	645	390	1,754	797
Total income tax expense	645	391	1,756	800
Net deferred tax assets	$ 11,011		$ 11,011		$ 14,115