Income Taxes (Details) (USD $)	3 Months Ended		9 Months Ended		3 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2014 Subsequent Event	Sep. 30, 2013 Restatement Adjustment
Effective Income Tax Rate Reconciliation, Percent	17.90%	11.50%	23.80%	18.70%
Income Tax Reconciliation, Tax Planning Initiatives		$ 4,000,000		$ 11,000,000
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	16,000,000		22,000,000	5,000,000
Tax Benefit From An Affiliate Reorganization		13,000,000		13,000,000
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount				4,000,000
Retained earnings adjustment						16,773,000
Tax payments related to Historic Boardwalk LLC	(54,000,000)		53,738,000	0
Receipts from partner					$ 60,000,000