Stock Compensation (Narrative) (Details) (USD $)	3 Months Ended						1 Months Ended	3 Months Ended				3 Months Ended		12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 Stock Options [Member]	Mar. 31, 2013 Stock Options [Member]	Mar. 31, 2014 Restricted Stock [Member]	Mar. 31, 2013 Restricted Stock [Member]	Mar. 31, 2014 2014 Performance-Based Restricted Stock Unit Program [Member]	Mar. 31, 2014 2014 Performance-Based Restricted Stock Unit Program [Member] item	Mar. 31, 2013 2012 Performance-Based Restricted Stock Unit Program [Member]	Mar. 31, 2014 2003 Plan [Member]	Mar. 31, 2014 2012 Plan [Member]	Mar. 31, 2014 Retirement Plan For Non-Employee Directors [Member]	Mar. 31, 2013 Retirement Plan For Non-Employee Directors [Member]	Dec. 31, 2011 Retirement Plan For Non-Employee Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares covered under Stock Option and Incentive Plan										1,500,000	1,000,000
Options granted			0	0
Restricted stock units granted					0	0
Options and restricted stock units authorized to grant	946,000
Number of defined targets to achieve for restricted stock unit awards, maximum								3
Number of defined targets to achieve for restricted stock unit awards, minimum								1
Length of Restricted Stock Unit program (in years)								4 years
Number of annual vesting installments								4
Approximate number of restricted stock units granted per year, maximum								103,600
Cumulative number of restricted stock units granted								103,600
Compensation expense							$ 858,000		$ 1,000,000			$ 75,000	$ 67,000
Stock options expense			122,000	115,000
Restricted stock units expense					175,000	195,000
Unamortized compensation expense			652,000		38,900,000		37,100,000	37,100,000				1,400,000	1,100,000
Weighted average recognized period of unamortized compensation expenses (in years)			2 years 4 months 24 days		5 years 7 months 6 days
Exercise of stock options, shares	40,973		40,973	31,000
Proceeds from the exercise of stock options	2,033,000	1,594,000
Aggregate intrinsic value of the stock options exercised			1,400,000	735,000
Number of units vested	8,430				8,430	8,910
Stock compensation, net, shares					5,341	5,661						0	0
Aggregate fair value of the shares vested					$ 708,000	$ 679,000
Shares approved for issuance												70,000
Number of shares granted for each year served												1,000
Maximum number of shares issued upon retirement												7,000		5,000