Income Taxes (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Net operting loss carried forward		$ 161,500
NOL expiration date	Expires in 2029
Excise tax rate	4.00%
Annual distribution of net taxable income for U.S. federal income tax not to apply to our earnings that we distribute (percent)	90.00%
Net taxable income subject to distribution (percent)	100.00%
Total Capital Loss Carryforwards
Net capital losses carried forward	121,400
Capital Loss Carryforwards Expiring 2013
Net capital losses carried forward		2,000
Capital Loss Carryforwards Expiring 2014
Net capital losses carried forward		87,400
Capital Loss Carryforwards Expiring 2015
Net capital losses carried forward		31,400
Capital Loss Carryforwards Expiring 2017
Net capital losses carried forward		$ 618