Condensed Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - $ / shares	Jun. 30, 2019	Dec. 31, 2018
Common stock, par value (usd per share)	$ 0.01	$ 0.01
Treasury stock, par value (usd per share)	0.01	0.01
Common stock, par value $0.01 per share
Common stock, par value (usd per share)	0.01	0.01
Treasury stock, at cost, par value $0.01 per share
Treasury stock, par value (usd per share)	$ 0.01	$ 0.01