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Stock-Based Compensation (Narrative) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified |
3 Months Ended | 12 Months Ended | |||
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Mar. 31, 2013
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Mar. 31, 2012
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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| Share-based Compensation [Abstract] | |||||
| Stock-based compensation expense | $ 1,500 | $ 1,100 | $ 4,688 | $ 1,287 | $ 492 |
| Capitalized stock-based compensation | 601 | 454 | 1,875 | 515 | 197 |
| Granted, Shares | 0 | 0 | 0 | 0 | 0 |
| Unrecognized compensation expense | $ 11,600 | $ 6,745 | |||
| Weighted average period | 1 year 8 months 9 days | 1 year 6 months 18 days | |||
| X | ||||||||||
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- Definition
Non-cash stock based compensation capitalized. No definition available.
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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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
Net number of share options (or share units) granted during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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