Stock Based Compensation (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stock-based compensation
Stock based compensation expenses	$ 621,000	$ 662,000	$ 776,000
Restricted stock/units awards
Stock-based compensation
Stock based compensation expenses	363,000	421,000	553,000
Deferred compensation	600,000	600,000	500,000
Amortization period for deferred compensation	4 years
RSA and PSI activity
Outstanding at beginning of period (in shares)	212,340	264,640	247,840
Awarded (in shares)	45,375	70,500	63,800
Vested (in shares)	(91,840)	(111,300)	(42,000)
Cancelled or forfeited (in shares)		(11,500)	(5,000)
Outstanding at end of period (in shares)	165,875	212,340	264,640
Unamortized deferred compensation cost	1,200,000	900,000	900,000
Performance share incentives
Stock-based compensation
Stock based compensation expenses	258,000	241,000	191,000
Deferred compensation	100,000	500,000
RSA and PSI activity
Outstanding at beginning of period (in shares)	102,500	54,000
Awarded (in shares)	3,375	52,500	54,000
Cancelled or forfeited (in shares)		(4,000)
Outstanding at end of period (in shares)	105,875	102,500	54,000
Stock options
Stock-based compensation
Stock based compensation expenses			$ 32,000
Incentive Stock Plan
Stock-based compensation
Shares of common stock reserved for grant	750,000
Number of common shares counted against the Authorized Plan Amount for each share granted as awards under options or stock appreciation rights	1
Number of common shares counted against the Authorized Plan Amount for each share granted as awards other than options or stock appreciation rights	2