Share-Based Compensation And Capital Stock Summary Of Activity Related To PVRSU Grants (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Performance Vested Restricted Stock Units [Member]
Performance vested restricted stock units granted at target	80,184	117,523	25,036
Weighted average grant date fair value per share	$ 39.48	$ 35.27	$ 41.25
Aggregate grant date fair value	$ 3,165	$ 4,145	$ 1,033
Stock units forfeited	3,334	57,176	43,179
Requisite service period			3 years
Performance Vested Restricted Stock Units [Member] | Minimum [Member]
Requisite service period	22 months	24 months
Performance Vested Restricted Stock Units [Member] | Maximum [Member]
Requisite service period	38 months	60 months
Restricted Stock [Member]
Performance vested restricted stock units granted at target	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
Stock units forfeited	40,552	26,824	68,580
Restricted Stock [Member] | Minimum [Member]
Requisite service period	12 months	12 months	12 months
Restricted Stock [Member] | Maximum [Member]
Requisite service period	48 months	68 months	48 months
Target Performance Not Met [Member] | Performance Vested Restricted Stock Units [Member]
Stock units forfeited			39,070
Employee Termination [Member] | Performance Vested Restricted Stock Units [Member]
Stock units forfeited			4,109