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Noncontrolling Interests - Holders of Convertible Limited Partnership Units in the Operating Partnership (Details) - Noncontrolling Interest
shares in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
shares
Jun. 30, 2016
shares
Jun. 30, 2017
shares
Jun. 30, 2016
shares
Noncontrolling Interest [Line Items]        
Percentage of ownership interest of noncontrolling interest 25.70%   25.70%  
Limited partnership units (in shares) 7,500   7,500  
Limited partnership units, conversion ratio 1   1  
Outstanding stock percent that should be acquired for rights to be exercised 39.90%   39.90%  
Limited partnership units convertible into shares of common stock, eligible for conversion (in shares) 920   920  
Fully converted partnership units and diluted weighted average shares outstanding (in shares) 29,400 28,900 29,400 28,800