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Consolidated Statements of Stockholders' Equity Parenthetical - $ / shares
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement of Stockholders' Equity [Abstract]                
Dividends declared per common share $ 0.09 $ 0.07 $ 0.07 $ 0.07 $ 0.07 $ 1.30 $ 0.07 $ 0.00