Dividends and Share Repurchases (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended	3 Months Ended		12 Months Ended	16 Months Ended
	Mar. 17, 2017	Nov. 30, 2016	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2017	Dec. 31, 2015
Dividends and Share Repurchases
Cash dividends paid	$ 800		$ 753	$ 696
Cash dividend (in dollars per share)	$ 0.135
Dividends payable date of record	Feb. 24, 2017
The stock repurchase program extension period.		12 months
Share repurchase program amount authorized		$ 7,200					$ 10,000
Shares repurchased (in shares)				50,068	0
Weighted average price per share (in dollars per share)				$ 53.52
Shares paid for tax withholding for share-based compensation						53,154
Weighted average per share prices for shares used to pay tax withholding liability (in dollars per share)						$ 53.59