Stock-Based Awards and Programs (Details 2) (Stock Options, USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Stock Options
Stock options
Outstanding, balance at the beginning of the period (in shares)	112,500	163,300
Exercised (in shares)	48,300	34,800
Outstanding, balance at the end of the period (in shares)	64,200	128,500
Exercisable (in shares)	64,200	128,500
Weighted Average Exercise Price
Outstanding, balance at the beginning of the period (in dollars per option)	$ 23.27	$ 23.15
Exercised (in dollars per share)	$ 23.70	$ 18.36
Outstanding, balance at the end of the period (in dollars per option)	$ 23.81	$ 23.15
Exercisable (in dollars per share)	$ 23.81	$ 23.15