Nature of Business and Accounting Policies - Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018	Jan. 01, 2018	Jan. 01, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Length of lease		15 years
Cumulative effect adjustment for adoption of new accounting guidance		$ (40,310)		$ 9,229	$ 0
Operating lease assets	$ 88,202
Present value of lease liabilities	95,796
Assets
Prepaid expenses and other current assets	213,515	137,889	$ 140,819
Property and equipment, net		758,085	812,005
Deferred tax assets	1,190,815	1,510,908	1,499,672
Other assets		61,674
Total assets	8,318,465	6,261,958	6,245,898
Liabilities and Shareholders’ Equity
Capital lease obligations, current portion			9,817
Other current liabilities		74,893
Capital lease obligations, excluding current portion			19,658
Construction financing lease obligation, excluding current portion			561,892
Long-term finance lease liabilities	538,576	569,487
Other long-term liabilities	183,318	70,226	108,853
Accumulated deficit	(1,852,978)	(3,029,788)	(2,989,478)
Total liabilities and shareholders’ equity	$ 8,318,465	6,261,958	6,245,898
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease assets		61,700
Present value of lease liabilities		71,900
Accumulated Deficit
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment for adoption of new accounting guidance		(40,310)		$ 33,349	$ (9,371)
Accumulated Deficit | Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment for adoption of new accounting guidance		40,300
Previously Reported
Assets
Prepaid expenses and other current assets			140,819
Property and equipment, net			812,005
Deferred tax assets			1,499,672
Total assets			6,245,898
Liabilities and Shareholders’ Equity
Capital lease obligations, current portion			9,817
Other current liabilities			40,589
Capital lease obligations, excluding current portion			19,658
Construction financing lease obligation, excluding current portion			561,892
Other long-term liabilities			26,280
Accumulated deficit			(2,989,478)
Total liabilities and shareholders’ equity			$ 6,245,898
Adjustments | Accounting Standards Update 2016-02
Assets
Prepaid expenses and other current assets		(2,930)
Property and equipment, net		(53,920)
Deferred tax assets		11,236
Other assets		61,674
Total assets		16,060
Liabilities and Shareholders’ Equity
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
Other long-term liabilities		43,946
Accumulated deficit		(40,310)
Total liabilities and shareholders’ equity		$ 16,060
Buildings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property and equipment useful life	40 years