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Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Statement of Stockholders' Equity [Abstract]        
Preferred stock dividends per share (in USD per share) $ 18.13 $ 18.13 $ 36.26 $ 36.26
Common stock dividends per share (in USD per share) $ 0.12 $ 0.12 $ 0.24 $ 0.24