CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Additional Paid-in Capital	Shareholders' Notes Receivable	Retained Earnings	Accumulated Other Comprehensive Loss	Series B Redeemable Preferred	Series C Redeemable Preferred
Balance at Dec. 31, 2009	$ 108,222	$ 144	$ 59,973	$ (1,013)	$ 53,055	$ (3,937)	$ 1	$ 1
Balance (in shares) at Dec. 31, 2009		14,421,736					1	1
Increase (Decrease) in Stockholders' Equity
Net income	1,662				1,662
Dividends paid	(8,222)				(8,222)
Adjustment for pension and postretirement benefit liability, net of tax of ($219) in 2012, $1,560 in 2011 and $327 in 2010	(494)					(494)
Interest on shareholders' notes receivable	(28)			(28)
Issuance and sales of common stock by Company through IPO	63,929	65	63,864
Issuance and sales of common stock by Company through IPO (in shares)		6,500,000
Issuance of non-vested common stock in connection with IPO		2	(2)
Issuance of non-vested common stock in connection with IPO (in shares)		208,130
Shares issued for options exercised in connection with IPO	1,661	2	1,659
Shares issued for options exercised in connection with IPO (in shares)		180,567
Fractional shares repurchased and retired in connection with IPO		(7)
Stock repurchases and retirement	559			559			(1)	(1)
Stock repurchases and retirement (in shares)							(1)	(1)
Deferred stock units converted		2	(2)
Deferred stock units converted (in shares)		174,229
Shares issued for options exercised	1,068	1	1,067
Shares issued for options exercised (in shares)		95,000
Stock based compensation	1,136		1,136
Balance at Dec. 31, 2010	169,493	216	127,695	(482)	46,495	(4,431)
Balance (in shares) at Dec. 31, 2010		21,579,655
Increase (Decrease) in Stockholders' Equity
Net income	19,040				19,040
Dividends paid	(25,793)				(25,793)
Adjustment for pension and postretirement benefit liability, net of tax of ($219) in 2012, $1,560 in 2011 and $327 in 2010	(2,658)					(2,658)
Adjustment for interest rate swap, net of tax of ($30) in 2012 and $230 in 2011	(391)					(391)
Interest on shareholders' notes receivable	(7)			(7)
Repayment of shareholders' note receivable	489			489
Shares issued for options exercised	1,343	3	1,340
Shares issued for options exercised (in shares)		319,383
Stock based compensation	1,873	1	1,872
Stock based compensation (in shares)		121,656
Balance at Dec. 31, 2011	163,389	220	130,907		39,742	(7,480)
Balance (in shares) at Dec. 31, 2011		22,020,694
Increase (Decrease) in Stockholders' Equity
Net income	6,012				6,012
Dividends paid	(18,231)				(18,231)
Adjustment for pension and postretirement benefit liability, net of tax of ($219) in 2012, $1,560 in 2011 and $327 in 2010	349					349
Adjustment for interest rate swap, net of tax of ($30) in 2012 and $230 in 2011	47					47
Stock based compensation	2,166	1	2,165
Stock based compensation (in shares)		110,302
Balance at Dec. 31, 2012	$ 153,732	$ 221	$ 133,072		$ 27,523	$ (7,084)
Balance (in shares) at Dec. 31, 2012		22,130,996