Stock-Based Compensation (Summary of Company's SARs Activity) (Details) (SARs [Member], USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
SARs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance	343,445
Granted	37,213
Exercised, Shares	(7,605)
Ending balance	373,053	343,445
Exercisable, Shares	248,071
Outstanding, Weighted Average Exercise Price	$ 32.01
Granted, Weighted Average Exercise Price	$ 61.64
Exercised, Weighted Average Exercise Price	$ 34.77
Outstanding, Weighted Average Exercise Price	$ 34.91	$ 32.01
Exercisable, Weighted Average Exercise Price	$ 29.40
Outstanding, Average Remaining Contractual Term Years	7 years 1 month 6 days	7 years 3 months 29 days
Outstanding, Average Remaining Contractual Term Years	7 years 1 month 6 days	7 years 3 months 29 days
Exercisable, Average Remaining Contractual Term Years	6 years 3 months 7 days
Outstanding, Aggregate Intrinsic Value	$ 12,137
Outstanding, Aggregate Intrinsic Value	5,435	12,137
Exercisable, Aggregate Intrinsic Value	$ 4,982