Basis of Presentation and Accounting Policies - Cumulative Effect of Applying ASC 842 to the Condensed Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Prepaid expenses and other current assets	$ 175,142	$ 137,889	$ 140,819
Property and equipment, net	733,509	758,085	812,005
Deferred tax assets	1,415,511	1,510,908	1,499,672
Operating lease assets	60,929	61,674
Total assets	7,514,553	6,261,958	6,245,898
Capital lease obligations, current portion			9,817
Other current liabilities		74,893	40,589
Capital lease obligations, excluding current portion			19,658
Construction financing lease obligation, excluding current portion			561,892
Long-term finance lease liabilities	541,561	569,487
Long-term operating lease liabilities	62,978	64,849
Other long-term liabilities	7,642	5,377	26,280
Accumulated deficit	(2,436,212)	(3,029,788)	(2,989,478)
Total liabilities and shareholders’ equity	$ 7,514,553	6,261,958	$ 6,245,898
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Prepaid expenses and other current assets		(2,930)
Property and equipment, net		(53,920)
Deferred tax assets		11,236
Operating lease assets		61,674
Total assets		16,060
Capital lease obligations, current portion		(9,817)
Other current liabilities		34,304
Capital lease obligations, excluding current portion		(19,658)
Construction financing lease obligation, excluding current portion		(561,892)
Long-term finance lease liabilities		569,487
Long-term operating lease liabilities		64,849
Other long-term liabilities		(20,903)
Accumulated deficit		(40,310)
Total liabilities and shareholders’ equity		$ 16,060