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Equity - Additional Information (Details) (USD $) Share data in Thousands, unless otherwise specified	1 Months Ended	3 Months Ended		3 Months Ended
	Oct. 31, 2013	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 8.5% Convertible perpetual preferred stock	Mar. 31, 2014 6.0% Convertible perpetual preferred stock	Mar. 31, 2014 7.0% Convertible perpetual preferred stock	Mar. 31, 2014 Treasury Stock	Mar. 31, 2013 Treasury Stock	Mar. 31, 2014 Restricted Stock	Mar. 31, 2013 Restricted Stock
Equity Disclosure
Preferred stock, dividend rate, percentage				8.50%	6.00%	7.00%
Retirement of treasury stock (in shares)							609	1,778
Retirement of treasury stock		$ 0					$ (3,677,000)	$ (11,216,000)
Stockholder settlement gross	5,000,000
Additional paid-in capital—stockholder receivable		(3,750,000)	(3,750,000)
Stock-based compensation									7,400,000	18,900,000
Stock-based compensation, capitalized									$ 1,900,000	$ 1,600,000

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Additional paid-in capital - stockholder receivable

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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The percentage rate used to calculate dividend payments on preferred stock.

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Amount of decrease of par value, additional paid in capital (APIC) and retained earnings of common and preferred stock retired from treasury when treasury stock is accounted for under the cost method.

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Number of shares of common and preferred stock retired from treasury during the period.

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