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Equity Offering (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Sep. 16, 2013
Equity Offering [Line Items]          
Proceeds from sale of common stock   $ 0 $ 0 $ 174,670  
Common Stock [Member]          
Equity Offering [Line Items]          
Stock Issued During Period, Shares, New Issues 5,175,000        
Stock Issued During Period, Value, Per Share Offering Price         $ 35.40
Stock Issuance Costs $ 8,500        
Proceeds from sale of common stock $ 174,700