Stock-Based Compensation (Summary Of Stock Options Under The 2007 Plan) (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) $ / shares shares
Shares
Options outstanding at beginning of year (in shares) | shares	298,000
Granted (in shares) | shares	0
Exercised (in shares) | shares	(66,000)
Forfeited and expired (in share) | shares	(63,000)
Options outstanding at end of year (in shares) | shares	169,000
Vested and expected to vest at end of year, Shares | shares	168,000
Exercisable at end of year (in shares) | shares	164,000
Weighted average exercise price
Options outstanding at beginning of year (USD per share) | $ / shares	$ 68.63
Granted (USD per share) | $ / shares	0.00
Exercised (USD per share) | $ / shares	73.33
Forfeited and expired (USD per share) | $ / shares	82.20
Options outstanding at the end of year (USD per share) | $ / shares	61.73
Vested and expected to vest, Weighted average exercise price (USD per share) | $ / shares	61.73
Exercisable, Weighted average exercise price (USD per share) | $ / shares	$ 61.73
Additional Disclosures
Options outstanding at end of year, Weighted average remaining contractual term (years)	4 years 8 months 12 days
Vested and expected to vest, Weighted average remaining contractual term (years)	4 years 8 months 12 days
Exercisable, Weighted average remaining contractual term (years)	4 years 7 months 6 days
Options outstanding at end of year, Aggregate intrinsic value | $	$ 21,496
Vested and expected to vest, Aggregate intrinsic value | $	21,492
Exercisable, Aggregate intrinsic value | $	$ 20,986