Share-Based Compensation And Capital Stock Summary Of Activity Related To Restricted Stock Grants (Details) (Restricted Stock [Member], USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Granted - Shares	225,240	266,159	247,298
Weighted average grant date fair value per share	$ 37.74	$ 35.76	$ 38.84
Aggregate grant date fair value	$ 8,500	$ 9,517	$ 9,604
Restricted shares forfeited	40,552	26,824	68,580
Grant date fair value of shares vested	$ 8,569	$ 6,696	$ 6,662
Minimum [Member]
Vesting service period of shares granted	12 months	12 months	12 months
Maximum [Member]
Vesting service period of shares granted	48 months	68 months	48 months