Stock Based Compensation Roll Forward Schedule of Stock Option Plan by Shares and Weighted Average Exercise Prices (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Roll Forward of Shares Outstanding [Roll Forward]
Outstanding, Beginning Balance, in shares	451,210
Granted, in shares	10,200	77,302	79,994
Exercised, in shares	(59,612)
Forfeited, in shares	(12,406)
Outstanding, Ending Balance, in shares	389,392	451,210
Exercisable at Period End, in shares	269,758
Vested and Expected to Vest, in shares	119,634
Roll Forward of Shares Outstanding - Weighted Average Exercise Price: [Roll Forward]
Outstanding, Beginning Balance, in Weighted Average Exercise Price,	$ 22.67
Granted, in Weighted Average Exercise Price	$ 23.80
Exercised, in Weighted Average Exercise Price	$ 21.02
Forfeited, in Weighted Average Exercise Price	$ 24.71
Outstanding, Ending Balance, in Weighted Average Exercise Price,	$ 22.89	$ 22.67
Exercisable at Period End, in Weighted Average Exercise Price	$ 22.29
Vested and Expected to Vest, in Weighted Average Exercise Price	$ 24.25
Outstanding at Period End, Weighted Average Remaining Contractual Life, in years	5 years 6 months 26 days
Exercisable at Period End, Weighted Average Remaining Contractual Life, in years	4 years 8 months 5 days
Vested and Expected to Vest, Weighted Average Remaining Contractual Life, in years	7 years 7 months
Outstanding at Period End, Aggregate Intrinsic Value	$ 1,429
Exercisable at Period End, Aggregate Intrinsic Value	1,152
Vested and Expected to Vest, Aggregate Intrinsic Value	$ 277
Shares Available for Grant at Period End, in shares	459,000