Shareholders' Equity Preferred Stock (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 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	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