Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2014		Dec. 31, 2013
Common Stock, par value (in dollars per share)	$ 0.001		$ 0.001
Common Stock, shares authorized	200,000,000		200,000,000
Common Stock, shares issued	145,471,000		144,334,000
Common Stock, shares outstanding	84,855,000		83,717,000
Treasury stock, par value (in dollars per share)	$ 0.001		$ 0.001
Treasury stock, shares	60,617,000		60,617,000
Series D, E, F, G and I Preferred Stock
Liquidation Preference (in dollars per share)	$ 25	[1],[2]	$ 25	[1],[2]
Series J convertible perpetual preferred stock
Liquidation Preference (in dollars per share)	$ 50	[1],[2]	$ 50	[1],[2]

[1] The Company declared and paid dividends of $2.0 million, $2.8 million, $2.0 million, $1.5 million and $2.3 million on its Series D, E, F, G and I preferred stock during the three months ended March 31, 2014 and 2013. The Company declared and paid dividends of $2.3 million on its Series J preferred stock during the three months ended March 31, 2014. All of the dividends qualified as return of capital for tax reporting purposes. There are no dividend arrearages on any of the preferred shares currently outstanding.

[2] Holders of shares of the Series D, E, F, G, I and J preferred stock are entitled to receive dividends, when and as declared by the Board of Directors, out of funds legally available for the payment of dividends. Dividends are cumulative from the date of original issue and are payable quarterly in arrears on or before the 15th day of each March, June, September and December or, if not a business day, the next succeeding business day. Any dividend payable on the preferred stock for any partial dividend period will be computed on the basis of a 360-day year consisting of twelve 30-day months. Dividends will be payable to holders of record as of the close of business on the first day of the calendar month in which the applicable dividend payment date falls or on another date designated by the Board of Directors of the Company for the payment of dividends that is not more than 30 nor less than 10 days prior to the dividend payment date.