Income Taxes (Income Tax Expense) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Current income tax expense	$ 0	$ 2
Deferred income tax expense	1,112	510
Total income tax expense	1,112	512
Net deferred tax assets	$ 9,685		$ 10,533