Stock-Based Compensation (Schedule of Restricted Stock Awards) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Grant Date - 2/1/2012 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Date	February 1, 2016
Grant Date - 2/1/2012 [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant Date	February 1, 2012
Shares	66,000
Grant Date Fair Value	$ 30.15
Aggregate Fair Value	$ 1,990
Grant Date - 3/6/2012 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Date	March 6, 2016
Grant Date - 3/6/2012 [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant Date	March 6, 2012
Shares	18,347
Grant Date Fair Value	$ 27.49
Aggregate Fair Value	504
Grant Date - 2/27/13 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Date	February 27, 2017
Grant Date - 2/27/13 [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant Date	February 27, 2013
Shares	12,973
Grant Date Fair Value	$ 42.49
Aggregate Fair Value	$ 551