Stock-Based Compensation (Details 1) (SOSARs [Member], USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
SOSARs [Member]
Summary of stock option activity
Shares, Outstanding at Jan 1	2,298,288	2,061,877
Granted	364,114	345,290
Exercised	(500,074)
Forfeited	(12,000)	(102,970)
Shares, Outstanding at Sep 30	2,150,328	2,304,197
Weighted Average Exercise Price, Outstanding at Jan 1	$ 12.35	$ 12.28
Weighted Average Exercise Price, Granted	$ 15.23	$ 12.56
Weighted Average Exercise Price, Exercised	$ 12.06
Weighted Average Exercise Price, Canceled/forfeited	$ 14.96	$ 12.55
Weighted Average Exercise Price, Outstanding at Sep 30	$ 12.94	$ 12.31
Weighted average grant date fair value per share	$ 4.94	$ 4.09
Aggregate grant date fair value	$ 1,797	$ 1,412
Black-Scholes Assumptions
Dividend yield	2.31%	2.87%
Risk free rate of return	1.02%	2.55%
Volatility	41.48%	41.91%
Expected Life	6 years	6 years