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	Comprehensive Income (Loss)	Series B Redeemable Preferred	Series C Redeemable Preferred
Balance at Dec. 31, 2008	$ 98,059	$ 144	$ 60,378	$ (1,116)	$ 43,212	$ (4,559)		$ 1	$ 1
Balance (in shares) at Dec. 31, 2008		14,454,369						1	1
Increase (Decrease) in Stockholders' Equity
Net income	9,843				9,843		9,843
Adjustment for pension and postretirement benefit liability, net of tax of $1,560, $327 and $365 for the year ended 2011, 2010 and 2009, respectively	622					622	622
Interest on shareholders' notes receivable	(34)			(34)
Stock repurchases and retirement	(268)		(405)	137
Stock repurchases and retirement (in shares)		(32,633)
Total comprehensive income (loss)							10,465
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		1,662
Dividends paid	(8,222)				(8,222)
Adjustment for pension and postretirement benefit liability, net of tax of $1,560, $327 and $365 for the year ended 2011, 2010 and 2009, respectively	(494)					(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
Total comprehensive income (loss)							1,168
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		19,040
Dividends paid	(25,793)				(25,793)
Adjustment for pension and postretirement benefit liability, net of tax of $1,560, $327 and $365 for the year ended 2011, 2010 and 2009, respectively	(2,658)					(2,658)	(2,658)
Adjustment for interest rate swap, net of tax of $230	(391)					(391)	(391)
Interest on shareholders' notes receivable	(7)			(7)
Repayment of stockholders' 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
Total comprehensive income (loss)							15,991
Balance at Dec. 31, 2011	$ 163,389	$ 220	$ 130,907		$ 39,742	$ (7,480)
Balance (in shares) at Dec. 31, 2011		22,020,694