Long-Term Incentive Compensation (Details) (Restricted Stock, USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Total expense recorded for stock based compensation
Total stock based compensation expense	$ 10,103	$ 8,512
Service Condition Stock Based Compensation Expense | The Plan
Total expense recorded for stock based compensation
Total stock based compensation expense	5,612	5,687
Performance Condition Stock Based Compensation Expense | The Plan
Total expense recorded for stock based compensation
Total stock based compensation expense	4,202	2,653
Stock Based Compensation Expense | The Plan
Total expense recorded for stock based compensation
Total stock based compensation expense	9,814	8,340
Canadian Plan Stock Based Compensation Expense | Canada E B Plan
Total expense recorded for stock based compensation
Total stock based compensation expense	$ 289	$ 172