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Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]            
Preferred stock, par value (in dollars per share) $ 0.01   $ 0.01      
Preferred stock, shares authorized (in shares) 5,000,000   5,000,000      
Preferred stock, shares issued (in shares) 0   0      
Preferred stock, shares outstanding (in shares) 0   0      
Common stock, par value (in dollars per share) $ 0.01   $ 0.01      
Common stock, shares authorized (in shares) 100,000,000   100,000,000      
Common Stock, Shares, Issued 50,879,949 50,820,548 50,719,884 50,719,884 50,685,699 50,598,901
Common stock, shares outstanding (in shares) 50,696,011   50,583,128