Stock-Based Compensation (Summary of Company's SARs Activity) (Details) (SARs [Member], USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
SARs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance, Shares	343,445
Granted, Shares	37,213
Exercised, Shares	(7,261)
Ending balance, Shares	373,397
Exercisable, Shares	248,415
Outstanding, Weighted Average Exercise Price	$ 32.01
Granted, Weighted Average Exercise Price	$ 61.64
Exercised, Weighted Average Exercise Price	$ 35
Outstanding, Weighted Average Exercise Price	$ 34.91
Exercisable, Weighted Average Exercise Price	$ 29.40
Outstanding, Average Remaining Contractual Term Years	7 years 3 months 29 days
Outstanding, Average Remaining Contractual Term Years	7 years 4 months 6 days
Exercisable, Average Remaining Contractual Term Years	6 years 6 months 7 days
Outstanding, Aggregate Intrinsic Value	$ 12,137
Outstanding, Aggregate Intrinsic Value	6,219
Exercisable, Aggregate Intrinsic Value	$ 5,506