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Stock-Based Compensation (Summary of Company's SARs Activity) (Details) (SARs [Member], USD $)
In Thousands, except Share data, unless otherwise specified
6 Months Ended
Jun. 30, 2013
SARs [Member]
 
Beginning balance, Shares 351,881
Granted, Shares 85,943
Exercised, Shares (28,270)
Ending balance, Shares 409,554
Exercisable, Shares 232,426
Outstanding, Weighted Average Exercise Price $ 27.52
Granted, Weighted Average Exercise Price $ 42.14
Exercised, Weighted Average Exercise Price $ 23.92
Outstanding, Weighted Average Exercise Price $ 30.84
Exercisable, Weighted Average Exercise Price $ 26.06
Outstanding, Average Remaining Contractual Term Years 7 years 4 months 2 days
Outstanding, Average Remaining Contractual Term Years 7 years 5 months 6 days
Exercisable, Average Remaining Contractual Term Years 6 years 2 months 29 days
Outstanding, Aggregate Intrinsic Value $ 4,988
Outstanding, Aggregate Intrinsic Value 6,251
Exercisable, Aggregate Intrinsic Value $ 4,658