Long-Term Equity Compensation (Schedule of Share-based Compensation Expense) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 28,334	$ 29,930	$ 28,893
Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	600	3,700	5,400
RSUs and PSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 27,700	$ 26,200	$ 23,500