Long-Term Equity Compensation (Schedule of Share-based Compensation Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 29,451	$ 28,334	$ 29,930
Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	28	574	3,711
RSUs and PSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 29,424	$ 27,759	$ 26,219