Condensed Consolidated Statements of Stockholders' Equity (Parenthetical) - shares	3 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018
Statement of Stockholders' Equity [Abstract]
Options exercised	0	0	0	29,199
Purchase of treasury stock (shares)	3,877	11,076	4,649	10,458
Issuance of restricted stock (shares)	19,162	61,263	19,177	63,275
Stock Issued During Period, Shares, New Issues	0	0	0	0