Condensed Consolidated Statements of Stockholders' Equity (Parenthetical) - shares	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Statement of Stockholders' Equity [Abstract]
Options exercised	0	29,199
Purchase of treasury stock (shares)	11,076	10,458
Issuance of restricted stock (shares)	61,263	63,275

Number of shares issued during the period related to Restricted Stock Awards, net of any shares forfeited.

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Name:	us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration