Stock-Based Compensation (Details 5) (Options and stock appreciation rights (SARs), USD $) In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Options and SARs outstanding
Number of awards options and SARs outstanding (in shares)	797	927
Options and SARs exercisable (in shares)	579	681
Weighted average exercise price of options and SARs (in dollars per share)	$ 23.52	$ 23.21
2014
Options and SARs outstanding
Number of awards options and SARs outstanding (in shares)	92
Options and SARs exercisable (in shares)	92
Weighted average exercise price of options and SARs (in dollars per share)	$ 22.69
2015
Options and SARs outstanding
Number of awards options and SARs outstanding (in shares)	1
Options and SARs exercisable (in shares)	1
Weighted average exercise price of options and SARs (in dollars per share)	$ 20.90
2016
Options and SARs outstanding
Number of awards options and SARs outstanding (in shares)	144
Options and SARs exercisable (in shares)	144
Weighted average exercise price of options and SARs (in dollars per share)	$ 24.07
2017
Options and SARs outstanding
Number of awards options and SARs outstanding (in shares)	120
Options and SARs exercisable (in shares)	120
Weighted average exercise price of options and SARs (in dollars per share)	$ 26.81
2018
Options and SARs outstanding
Number of awards options and SARs outstanding (in shares)	73
Options and SARs exercisable (in shares)	73
Weighted average exercise price of options and SARs (in dollars per share)	$ 23.37
2019
Options and SARs outstanding
Number of awards options and SARs outstanding (in shares)	77
Options and SARs exercisable (in shares)	60
Weighted average exercise price of options and SARs (in dollars per share)	$ 22.14
2020
Options and SARs outstanding
Number of awards options and SARs outstanding (in shares)	77
Options and SARs exercisable (in shares)	45
Weighted average exercise price of options and SARs (in dollars per share)	$ 21.03
2021
Options and SARs outstanding
Number of awards options and SARs outstanding (in shares)	62
Options and SARs exercisable (in shares)	25
Weighted average exercise price of options and SARs (in dollars per share)	$ 23.78
2022
Options and SARs outstanding
Number of awards options and SARs outstanding (in shares)	97
Options and SARs exercisable (in shares)	19
Weighted average exercise price of options and SARs (in dollars per share)	$ 22.87
2022
Options and SARs outstanding
Number of awards options and SARs outstanding (in shares)	54
Weighted average exercise price of options and SARs (in dollars per share)	$ 22.89