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Asset Acquisitions (Narrative) (Details) - USD ($)
$ in Thousands
 1 Months Ended
Sep. 30, 2011
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Business Acquisition [Line Items]          
Goodwill, net   $ 826,476 $ 685,310 $ 685,310 $ 685,310
Minimum          
Other Acquisitions          
Obligation to fund certain pre-development costs, annual amount   1,000      
Maximum          
Other Acquisitions          
Obligation to fund certain pre-development costs, annual amount   2,000      
Development Agreement          
Business Acquisition [Line Items]          
Purchase price $ 24,500        
Peninsula          
Business Acquisition [Line Items]          
Goodwill, net   $ 459,273