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Equity - Additional Information (Details) (USD $) Share data in Thousands, unless otherwise specified	1 Months Ended	6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended	6 Months Ended
	Oct. 31, 2013	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 Restricted Stock	Jun. 30, 2013 Restricted Stock	Jun. 30, 2014 Restricted Stock	Jun. 30, 2013 Restricted Stock	Jun. 30, 2013 Restricted Stock Separation of Former Executives	Jun. 30, 2013 Restricted Stock Separation of Former Executives	Jun. 30, 2014 Treasury Stock	Jun. 30, 2013 Treasury Stock	Jun. 30, 2014 8.5% Convertible perpetual preferred stock	Jun. 30, 2014 6.0% Convertible perpetual preferred stock	Jun. 30, 2014 7.0% Convertible perpetual preferred stock
Equity Disclosure
Preferred stock, dividend rate, percentage												8.50%	6.00%	7.00%
Retirement of treasury stock (in shares)										637	5,107
Retirement of treasury stock		$ 0								$ (3,865,000)	$ (27,196,000)
Stockholder settlement gross	5,000,000
Additional paid-in capital—stockholder receivable		(3,750,000)	(3,750,000)
Stock-based compensation				6,100,000	51,700,000	13,500,000	70,700,000	40,900,000	48,500,000
Stock-based compensation, capitalized				$ 1,800,000	$ 1,300,000	$ 3,000,000	$ 2,900,000

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- Definition

Additional paid-in capital - stockholder receivable

+ References

No definition available.

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- Definition

Stockholder settlement gross

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-SubTopic 10

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Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, 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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-Publisher SEC

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-Number 210

-Section 04

-Article 3



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

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