Shareholders' Equity (Narrative) (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015 USD ($) $ / shares	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) item $ / shares	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Shareholders' Equity [Abstract]
Distributions recorded to preferred shareholders	$ 15,100,000	$ 15,100,000	$ 30,244,000	$ 30,244,000
Number of quarterly dividends in arrearage before preferred shareholders can elect additional board members | item			6
Number of additional board members the preferred shareholders can elect in the case of an excess arrearage of quarterly dividends | item			2
Dividends in arrears			$ 0
Redeemable preferred stock, redemption price per share | $ / shares	$ 25.00		$ 25.00
Preferred stock, aggregate deferred issuance costs outstanding			$ 31,800,000		$ 31,800,000