Isle Acquisition and Preliminary Purchase Price Accounting - Summary of Preliminary Purchase Price Accounting to Identifiable Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Jun. 30, 2017	May 01, 2017	Dec. 31, 2016
Business Combinations [Abstract]
Current and other assets, net		$ 134,143,000
Property and equipment		853,331,000
Goodwill	$ 746,482	679,656,000	$ 66,826
Intangible assets		470,811,000
Other noncurrent assets		11,025,000
Assets held for sale		143,592,000
Total assets		2,292,558,000
Current liabilities		(138,475,000)
Deferred income taxes		(187,127,000)
Other noncurrent liabilities		(26,762,000)
Liabilities related to assets held for sale		(5,449,000)
Total liabilities		(357,813,000)
Net assets acquired		$ 1,934,745,000