Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Narrative) (Details)

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Stock-Based Compensation (Narrative) (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Share-based Compensation [Abstract]        
Stock issued     0  
Stock-based compensation expense $ 3,400,000 $ 1,500,000 $ 7,700,000 $ 3,000,000
Capitalized stock-based compensation 1,343,000 600,000 3,066,000 1,201,000
Unrecognized compensation expense $ 23,200,000   $ 23,200,000  
Weighted average period     19 months 27 days