Stock-Based Compensation (Narrative) (Details) (USD $)	12 Months Ended		12 Months Ended							3 Months Ended			12 Months Ended
	Dec. 31, 2012	Oct. 30, 2012	Dec. 31, 2012 Stock Options	Dec. 31, 2012 Stock Options Employees	Dec. 31, 2012 Stock Options Non-employee directors	Dec. 31, 2012 SARs	Dec. 31, 2012 Restricted Shares	Dec. 31, 2011 Restricted Shares	Dec. 31, 2010 Restricted Shares	Mar. 31, 2012 Restricted Shares Two-year time-based vesting	Mar. 31, 2012 Restricted Shares Three-year time-based vesting	Mar. 31, 2012 Restricted Shares Two-year performance-based vesting	Dec. 31, 2012 Restricted Shares Two-year performance-based vesting	Dec. 31, 2012 Restricted Shares Employees Minimum [Member]	Dec. 31, 2012 Restricted Shares Employees Maximum [Member]	Dec. 31, 2012 Restricted Shares Non-employee directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maxmimum Percentage of Restricted and Unrestricted Stock Issuable Under Equity Plan	50.00%
Common shares authorized under the 2006 Equity Plan	500,000
Awards expiration period			10 years			10 years								1 year	3 years	6 months
Awards vesting period				3 years	6 months	3 years				2 years	3 years	2 years
Awards restrictions lapsing period upon performance achievement													2 years
Performance achievement goal, cumulative diluted earnings per share over three-year period ending December 31, 2013													$ 2.83
Performance achievement goal, achievement measurement period													3 years
Total intrinsic value of awards released in period							$ 77,000	$ 307,000	$ 94,000
Unrecognized stock-based compensation expense related to unvested awards, amount	627,000
Unrecognized stock-based compensation expense related to unvested awards, weighted-average period of recognition	1 year 6 months 1 day
Unrestricted Stock Granted to Employees		8,490
Stock or Unit Option Plan Expense	$ 180,000