Shareholders' Equity Preferred Stock (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Class of Stock [Line Items]
Payments for Repurchase of Redeemable Preferred Stock			$ 17,656,000	$ 177,955,000
Other Preferred Stock Dividends and Adjustments	0	0	483,000	(5,932,000)
Cumulative Preferred Stock [Member]
Class of Stock [Line Items]
Stock Repurchased During Period, Shares			750,243
Stock Repurchased During Period, Value			18,800,000
Payments for Repurchase of Redeemable Preferred Stock			17,700,000
Issuance Costs [Member] | Cumulative Preferred Stock [Member]
Class of Stock [Line Items]
Other Preferred Stock Dividends and Adjustments			(618,000)
Gain (Loss) Repurchase of Redeemable Preferred Shares (Member) | Cumulative Preferred Stock [Member]
Class of Stock [Line Items]
Other Preferred Stock Dividends and Adjustments			$ 483,000