Per Share Data (Computations of Basic Earnings Per Share and Diluted Earnings Per Share) (Details) $ / shares in Units, $ in Thousands			3 Months Ended
		Apr. 21, 2017	Mar. 31, 2017 USD ($) $ / shares shares	Mar. 31, 2016 USD ($) $ / shares shares
Basic Earnings per Share:
NET INCOME | $			$ 9,556	$ 5,146
Weighted Average Shares Outstanding (in shares)	[1]		22,908,648	20,887,284
Basic Earnings per Share (USD per share) | $ / shares	[2]		$ 0.42	$ 0.25
Diluted Earnings per Share:
NET INCOME | $			$ 9,556	$ 5,146
Weighted Average Shares Outstanding (in shares)	[1]		22,908,648	20,887,284
Potentially Dilutive Shares, Net (in shares)			0	6,115
Diluted Weighted Average Shares Outstanding (in shares)	[1]		22,908,648	20,893,399
Diluted Earnings per Share (USD per share) | $ / shares	[2]		$ 0.42	$ 0.25
Anti-dilutive securities excluded from computation of earnings per share (in shares)			0	0
Subsequent Event
Diluted Earnings per Share:
Stock split, conversion ratio		0.6667

[1] Share and per share data has been adjusted to reflect a 3-for-2 stock split on April 21, 2017.

[2] Per share data has been adjusted to reflect a 3-for-2 stock split on April 21, 2017.