Consolidated Statements of Stockholders' Equity (Parenthetical) - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Statement of Stockholders' Equity [Abstract]
Shares issued from stock option exercises	0	29,199
Purchase of treasury shares (shares)	22,482	15,107
Issuance of common stock (shares)	0	0
Issuance of restricted stock (shares)	137,060	107,388