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Equity - Treasury Stock Activity (Details) - USD ($)
shares in Thousands
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Equity, Class of Treasury Stock [Line Items]    
Value of shares withheld for taxes $ 41,000  
Retirement of treasury stock $ 0  
Treasury Stock    
Equity, Class of Treasury Stock [Line Items]    
Number of shares withheld for taxes 933 1,279
Value of shares withheld for taxes $ 41,000 $ 2,093,000
Retirement of treasury stock (in shares) 933 1,279
Retirement of treasury stock $ 41,000 $ 2,093,000