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Stockholders' Equity (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Jun. 30, 2014
Aug. 17, 2012
Stockholders' Equity Note [Abstract]        
Common stock, par value (in dollars per share) $ 0.01   $ 0.01 $ 0.01
Maximum price of common stock available to be issued     $ 149,093,000 $ 500,000,000
Commission to sales agent (as a percent)       2.00%
Common stock sold (in shares) 2,456,956 2,961,903    
Proceeds from sale 173,011,000 177,896,000    
Shares issued during the period $ 171,102,000 $ 175,649,000