Calder Exit Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]
Calder exit costs	$ 13,854	$ 2,298	$ 0
Calder grandstand impairment charge	12,700
Adjustment | Selling, General and Administrative Expense
Restructuring Cost and Reserve [Line Items]
Calder exit costs	(2,300)
Adjustment | Calder Exit Costs
Restructuring Cost and Reserve [Line Items]
Calder exit costs	2,300
Calder Exit Costs
Restructuring Cost and Reserve [Line Items]
Calder exit costs	13,900
Demolition costs	1,200
Calder Exit Costs | Adjustment | Selling, General and Administrative Expense
Restructuring Cost and Reserve [Line Items]
Calder exit costs		(2,300)
Calder Exit Costs | Adjustment | Calder Exit Costs
Restructuring Cost and Reserve [Line Items]
Calder exit costs		$ 2,300
Grandstand assets | Calder Exit Costs
Restructuring Cost and Reserve [Line Items]
Calder grandstand impairment charge	$ 12,700